You've GOT to check out artist Julian Beever's 3D chalk illusions!!! Go here to see some truly mind-bending work and then go out and create your own artwork!
I've been inspired by his art and art I've seen from Kinley and Cohen Bragg! They sent me a pretty cool picture of their abstract art chalk creation using tape to separate their "paper" into sections and colored in each section with a different color!
Keep on creating kids!!!!
Here is the Julian Beever link again just in case :)