Tara Donovan's work is amazing, she take ordinary objects and turns them into amazing abstract works. The top one is made with Styrofoam cups and the second is made of buttons. some of her other work is made from drops of glue, torn paper and even cubes of pins and toothpicks held only by gravity and friction. amazing stuff
also another cool artist to check out is Dalton Ghetti, he whittles stuff out of pencils!