You can take a picture you like and cut out thousands of tiny pieces of paper to recreate it with? That challenges one's patience and creativity, believe me lol.
Make some art out of recycled stuff or garbage. How green, hmmm?
Fill up your sketchbook- draw open closets, cut up fruit, shoes, people sleeping etc. One of my favorite things to do is a timed 5 minute sketch of a movie cover or something of that nature.
Have any boring tees? Tie-dye! Or paint/sharpies and make them AWESOME and you!
Make flowers out of tissue paper and wire- super easy, and almost without fail comes out pretty. And they wont die!
I'm hoping to think of more, since I want a lot of summer projects too