Does any one have any idea or can suggest to whom I should peak about this question?

I have a basic design ( attached see link TEST ) that is used on a framing mount website to illustrate a product. I see some other framing websites like ours have choice of colours the client can select for the mount to be cut from. On these websites when a color is selected the image colour changes to match this. has any one any idea how to achieve this ?

TEST.xar

PS I do have instantly using email activated but I do not always get notifications via emails so if I am slow to respond my apologies.