RULES! They are very simple: Send me a link to your finished work, I like seeing what you come up with. In your description, write down that you used a stock image from me. Simply typing in my screen name is fine. I don't care how you use the image, go nuts.
UPDATE: Oh my gosh, thank you, everyone for the DD! This came less than a week before my 24th birthday, no less! What an amazing gift! The rules have not changed, feel free to use it as stock any way you please, as long as you cite me and send me a link. I'd never yell at what you guys make with my stock, I just like looking at how people use it!