This is what my prickly pear cactus looks like right now. The red "fruit" is what people make prickly pear jelly and other concoctions from. Some day I'll have to try it. We'll see if it's this year. I hate to see them ripen and not use them, but the birds seem to like them if I don't do anything.
Here's a Cooks.com site with some interesting recipes for ways to use the fruit and even the cactus, I think.