The great thing about not using traditional art supplies is it leaves a lot of doors open. Potentially anything could be considered an art supply, and it's up to the artist to decide what to use. I personally don't like creating sculptures however, and most of the projects shown in the article were sculptures. I prefer using my creativity to paint and create 2D artwork and I don't feel that I should be considered less creative because of this.
Here are some art pieces made from non traditional art supplies like candy and wood:
This piece of art is really cool because it uses creepy doll parts to make a head. This project wouldn't be nearly as interesting if it was made with traditional art supplies.
This Marilyn Monroe was made with candy although r it may not look like it. It's so well pieced together that it sets it apart from all of the other mundane artwork done of her.
This non traditional piece of artwork is really cool because it incooperates nature. Using rings from trees is a unique idea and are not available in traditional art stores.
Here is another piece made from candy because making art from candy seems to be a standard for non traditional art. I like how the sweet candy contrasts with the deathly theme in this piece.
It's sort of hard to tell in this picture but this is a sculpture created out of nails. I like this use of non traditional art materials because it's not clear what medium was used, and it seems that there is a reflection off of the piece that makes it look like feathers.