Here are some I found....
You could enlarge the size of the block for the fish on this.
http://www.quilterbydesign.com/trio.html
There's a 6" angel fish on this page
http://www.geocities.com/Heartland/Hills/6649/paperpiece.html
Not sure on the size of this one, but you can take a looksie
http://www.quilterbydesign.com/lessons/fish/fish_placemats.html
This one has some fish blocks.
http://www.craftandfabriclinks.com/fish_wallhanging/fish_block_wallhanging.html