Here's a couple to get you started:
http://www.warner-criv.com/patterns.aspx
http://www.ivyjoy.com/coloring/search.html
I get a lot of my images from colouringbookfun.com
I do a search on Yahoo. At the top I choose images and type in exactly what image I'm looking for. Once it finds the image, you can narrow it down to only black & white which will tend to give you a better image for doing a FBCT. In my gallery, the wise men, My Little Pony, baby shower with the woman, and the graduation cakes were all FBCT's. All the rest of the picture cakes were piping gel transfers. Just from experience though, if you use the chocolate icing that comes in a can from Wilton---DON'T try to do a FBCT with it! It won't freeze even if you leave it in the freezer for hours. I had to freehand most of my wise guys b/c of that problem.
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