Hi BamBam
If you have photoshop or something similar, its not too tricky to make a colouring pic of yourself, following these instructions:
fototiller coloring pages from your photos - 3 easy photoshop steps
Ive done this one for you, very quickly, so you can see how it might look. Yeah, too much free time on my hands!
As long as the generic pic doesnt have any copyright issues, then I cant see anything wrong with that.