Build an Online Store: variant images

[login to view URL] I want the freelancer to make something that does the function of this app. The difference I want- instead of the color name, I want the thumbnail of the last image of the color variant to come. Also, right now I AM bulk uploading the images. I hope I can do it even after editing the code. Furthermore, 4 months back I got a customization done in the store which displayed color variants of the same product ( but listed as separate product ) on the product page under the "other colors" column. This was done by assigning a common hashtag to all the color variants of a product. Now that won't be needed anymore.