These are very simple. All I ask is that you link back to my account, preferably the image you used, and that you have fun with it. Please actually manipulate the image, don't simply overlay a filter. But have fun! And then let me know that you used it. So, in short:
1. Credit me with a link to the image.
2. Let me know via a note or a comment on the image you used linking me to your art.
3. Have fun!