STORAGE BASKETS (www.instructables.com) 

... made from LDPE plastic bags can be used for a variety of purposes, e.g. as a laundry bag if made big enough. 
How it is made: A step-by-step instruction on how to weave or make such baskets is available online.
Circularity: This application contributes to circularity of plastics because the re-used plastic bags are (almost) intact and this application prolongs the use of the plastics, and the baskets are purely recyclable.
Impact: Weaving such baskets can contain large amounts of plastic (waste) bags. Moreso, in addition to making a few to satisfy family needs, it can be weaved for sale and serve as extra source of income.

TOTES & RUGS  (www.myrecycledbags.com) 

... made from plastic yarn, or "plarn", are easy to clean. Remember not to dry it in sunlight or in a dryer, though, as both the sunlight and high temperature may degrade the (LDPE) plastics.
How it is made: Just like the storage basket, the plarn products require some weaving or knitting skills. A detailed instruction on how to make it is available online.
Circularity: This application is a genuinely circular as no degradation of the plastic materials occurs.
Impact: It can substitute products of less circular materials and can be sold for profit.

BACKPACKS (www.reformafrica.org)

... are made from plastic waste by a small and medium enterprise in Uganda.
How it is made: Plastic bags and bottles (LDPE and PET) are collected from streets or sourced from middlemen - then sorted and cleaned before being dried by the sun. The material is then "fused”, cut, and shaped to make the final products - backpacks and shopping bags. 
Circularity: Reform Africa insists this application is actually upcycling, since the products have greater value than the feedstock.
Impact: Bags and backpacks are sold in 6 boutiques across Uganda and on the Reform Africa website at prices ranging from $9 to $25. Sales have expanded to the Netherlands, Germany, Great Britain, and the United States.

LAMP SHADES (www.handimania.com)

... made from plastic utensils, using only glue, a knife and a pair of scissors.
How it is made: DYI instructions are readily available online.
Circularity: The appication is somewhat circular, as the plastic materials are not degraded by chemicals, heat, or exposure to sunlight.
Impact: With the proper design, lamp shades made from post-consumer plastics do fetch good prices in online stores.

DRINK COASTERS (www.craftpassion.com)

... made from plastic straws, still prevalent in many parts of the world (although banned in Europe).
How it is made: Individuals who enjoy craft work can easily learn weaving online and make eco-friendly coasters for home use and for sell. 
Circularity: The straws are undamaged and the application is genuinly circular. 
Impact: Making coasters for sale will prevent those straws from polluting the environment. 

OTTOMAN SEATS (www.icreativeideas.com)

...in different sizes and shapes can be created from plastic (PET) bottles.
How it is made: Depending on the desired size of the ottoman, typicall between 18 and 30 two-liter drink bottles are used. A step-by-step procedure is available online.
Circularity: Since the plastic bottles are (almost) intact, this application may be classified as upcycling. Hence, the plastics are retained in use and are recyclable at the end-of-life of the ottoman seats.
Impact: This application prevents post-consumer plastic from polluting the environment, and it offers opportunities for business development and income generation.

PAVING TILES (www.gunjurplastics.com)

... are made from melted plastic waste and a local filler. This is arguably the most prevalent application of plastic waste globally.
How it is made: Melt plastic waste in an iron pot over open fire, mix it with sand, and allow it to harden in a mold.
Circularity: This application is clearly downcycling the plastic, although durable tiles are eco-friendly and could be considered sustainable - especially if compared to the alternative fate of the post-consumer plastics.
Impact: This application has resulted into business opportunities that in turn provides employment and social upliftment. Gunjuru Plastics in the Gambia also offers extra services such as laying of floor tiles for customers and training locals in sorting and recycling plastics.

BUILDING BRICKS (www.conceptosplasticos.com)

... are made for post-consumer plastic waste plus a filler of some sort.
How it is made: Combing melted plastics and sand.
Circularity: This application is clearly downcycling the plastic, although durable tiles are eco-friendly and could be considered sustainable - especially if compared to the alternative fate of the post-consumer plastics.Circu
Impact: Conceptos Plasticos changes lives through social and economic power for women and youth collectors in developing countries.

TABLES FROM OLD TIRES (www.ideasdecor24.com)

... can be both beatiful and artistic!
How it is made: Combining creativity and basic craftmanship.
Circularity: The rubber material can always be recovered and recycled, hence the application is both circular and upscaling.
Impact: Clearly a positive impact on the environment.

DOG TOYS (www.westpaw.com)

... are made from ocean plastics and waste diverted from landfills. These are bouncy, chewy, and durable toys popular amongst dog lovers.
How it is made: The startup company uses a unique inhouse technique to manufacture its toys, as explained online. 
Circularity: The company employs a return policy for its products, encouraging products to be returned at end of life for recycling or re-manufacture. This together with consideration for durable products during the design phase implies that this application of plastic waste contributes to circularity of plastics through upcycling.
Impacts: Eliminating plastic waste for entering the environment.

ART (www.facebook.com/prestgaardandersen)

Kari Prestgaard and Astor Andersen are an artist duo from Norway.
How it is made: Applying artistic talent and creative skills to transforming ocean plastic waste into interesting works of art.
Circularity: Clearly a good example of upscaling and circularity.
Impact: The duo put of a lot of effort into creating awareness among children.

MAKE IT PRECIOUS (www.preciousplastic.com)

A big bang for plastic recycling. Start a business from plastic waste!
How it is made: "Starterkits" to create recycling spaces are available online.
Circularity: Clearly a good example of upscaling plastic waste.
Impact: Creating jobs and combatting waste with minimal capital requirements.