Here'a a link to an online article about flyfishing for carp. It's a great article with plenty of useful information. It even mentions using a bread fly and has a drawing of one, but it does not have a photo or tying instructions.
Here is the main page for the article:
Here is the page with the bread fly:
Hope this helps! Please come back and report your results!
edit: By the way, if you do a search for carp on this site you will find some good information. There are several members here that enjoy flyfishing for carp.