Photoshop is a definate must...I love mine. I thik it is a cute idea and I do think that people would go for it. I don't know if you would be able to go to a store and do it since you homeschool but if you are only there say on the weekends then maybe it would work for you. Schedule as many as you can in that time span and the rest of the week is at home creating the pix and stuff for your clients.
Think...holidays...Santa, Easter Bunny, oh yeah I can see it working for you.

:P :P