[quote=TheEvanCat]
I use words because I believe that finding pictures is lazy.
[/quote]

I don't think it's lazy. On the contrary, I think it poses a unique new challenge. Often, I find a picture before I do anything else. Then, using that image, I craft my character. I can base everything off a facial expression, a prop, or an item of clothing in the image. Person has a tattoo or piercing? Tweak their background to explain why. I don't think it is lazy or cheating in any way. It is just a different approach.

To answer your question, OP, I generally use Google or Tumblr.