Café Wall Lattice
This illusion was the first thing to come to mind for this challenge. Using my lattice technique, I was able to get the complicated color-changes with holes (or cuts in this case). Unfortunately the illusion doesn't appear all that well. As it turns out, you really need to have all edges fully straight so that the horizontal lines appear slanted due to the squares placement. Oh well, it's the thought that counts!
Challenge
Optical Illusions