And you can't mention the word 'nudity' in the thumbnail if you make your own.  Yes, I got the 'nice' email and had to submit a new thumb, or use their advisory thumb.   

From FAQ section

"If you remove my thumbnail with nudity/violence in it, will I lose my comments and rankings?  Last modified 2007-01-06 22:18
Response:

No, we place your image into the Holding area until you supply us with a new thumbnail. We then replace your image in the gallery and any comments, rankings and views remain with it.  If you do not supply us with a new thumbnail with no nudity/violence in it within the 48 hour timeframe, the image will then be permanently removed."

Images that run around in my head eventually end up in my gallery.

Dragons like to have fun too!  Dragon Mischief Art