Michelle Brand, created a curtain using the bottoms of plastic bottles. I found this really neat, because your using something useful, with such a common object, and you wouldn't expect it. The bottoms of the bottles look like a flower giving it a "design", but in general it looks really cute, and it's very abstract.
http://craft.easyfreshideas.com/curtains-made-plastic-bottles/
http://craft.easyfreshideas.com/curtains-made-plastic-bottles/
Yaroslav Olenev, made a lamp out of a plastic jug and spoons. The jug he used was an ombre blue color. He took off the handles of the plastic spoon and glued them on. I found this art piece fascinating because when you turn the light on it gives you different colors, and it just has this odd shape and texture from the look of it. I would love to do this actually, just because you could do so much with it. You can do a different pattern with the spoons and change the colors and taken it into your own hands.
Lisa Be, an artist and activist, made a mosaic out of bottle caps after the hurricane Sandy. I honestly found this inspiring. She used over 25,000 bottle caps, to create a sunset over the ocean. The bottle caps gave it texture and a realistic look. She had hot glued bottle caps inside of each other giving it more of detailed look. It brightened up the street.