it's pretty straight forward to do them yourself if you just want a photo sized one - programs like photo shop or gimp make it easy enough

i create them myself, take them to bigw, they're printed for 10 or 15c - done!

at the moment, i'm working on a spongebob invite for my friends son's 3rd birthday - have to spend a few minutes with him tomorrow catching a nice photo - he frowns for his mum ALL THE TIME!