easy to use visualzation program?

[Ericfi1]

A friend of mine is in the painting business.
He's been looking for a Visualization program he can use to add colors directly to a picture without having to send it in to a company to have done and wait several days.
He's tried Adobe Photoshop and Illustrator and discovered that it's pretty complicated for him to use. (I have told him to take some classes on it). But he's seen some other paint companies with programs that are easy to use but are proprietary.

He's been downloading some weird programs from some places I laughed at.. 1 from Austrailia, Vietnam, India and Ukraine.
Miraculously.. no malware!

Anyone have any ideas on an easy to use graphics program to do this?
And an added bonus would be if it could accept a color pallet designed for Photoshop.

Thanks!