Create Basic Color Generator for Icon Font

General information for the business: We Sell Icons Online
Description of requirements/functionality: I am looking to try to add a basic color generator on my website or at least be able to include it to buyers of my icon packs.
I would want a minimal design where they can choose say up to 6 basic colors. I would also want to include the option for adding a background shape as well. The last option would be to create different sizes as well. Currently offered in 60px.
I have a sample site that I would like to model after. Please contact me for the web address.
Specific technologies required: html, css, js
OS requirements: Mac OS
Extra notes: Time Frame: Not a Rush Job, but I am wanting to implement it soon.
For people to get an idea of what my icons could look like with different colors, background, or size so I can help sell my icons better. I currently offer them in line style only in 60px.
I would like it preloaded with a handful of icons & then an option to add icons by the user.

The other option is too take a free icon generator & load it to my site with my own icons. Just need someone to add my icons & change the code a little bit to host on my site.