You give me photos, or I make up some images.
I give you JPGs or prints or printed stickers. You glue those to chocolate.
How do I glue the images to chocolate?
Apply them over the existing wrapper. Wrap around and use double sided tape or a glue stick. They can also be printed as stickers which are more expensive to print but can go on anything.
This is very easy to do, and you can do it with a glass of wine in the other hand.
How much does it cost?

What if I want some goofy thing that isn't favors?
Yeah, I do that. Some of it is so goofy that I don't want to post it here. Do you want to doctor a photo so it looks like a famous person is wearing your obscure band's t-shirt? That can happen. Do you want to put the logo of a nonprofit organization onto a bag of chips? I've done that.
What about things that aren't frivolous?
Yes, I can retouch the damaged photo of your great grandparents. Results depend on level of damage.