Hi,
I'm well skilled in different graphic design categories. Please, take a look at my portfolio, here at Freelancer, to see some of my past work. I'm a professional, so you can expect pro results, full attention and cooperation.
Assuming that resolution of the images are good, changing these 10 colors and removing background will be 20USD per image. To be sure that I can do it, I'll do one-two color changes and background removal for sample.
I know that some colors will be better looking that others, depending of those color shading. It won't be 100% perfect.
Payment after final design proof.
Regards,
Arsen