I have made it my personal goal to conquer Illustrator. I can do the fancy tricks with gradients and transparency; now, I'm trying to get together a coherent illustrative style with this program as my ally.
So, first, my Illustration Concepts book cover piece. I chose to re-do The Picture of Dorian Gray. The front cover and spine text is all hand-drawn, and the back is fonts. The gold leaf designs were free vectors from BenBlogged, but I did all the arrangement and patterning myself.
And then some fun for myself--I've been enjoying drawing little cute things like this, so I took my favorite one (a self portrait in my steampunk costume) in to play with more vectors.