This is a vector of the Cheshire Cat's smile, from Alice in Wonderland. I was designing an Alice-In-Wonderland themed layout recently for my friends GaiaOnline account, and I created this to go with it. You can use this for anything, as long as it's not commerical.
Please let me know if you use it
Note: This includes all three versions shown in the preview above, in .AI format, as well as .PNG. If I have enough requests, I'll save them as .EPS or something for wider use.