This is very simple plug-in for customizing products variants. It's useful if you have products with many color variants and you want to show image of it. Plug-in shows dropboxe for each variant and for each variant you can set image layer that is changing with selection.
So if we look one example - T-Shirt maker - plug-in sets background (different T-Shirts) and stickers. You need to add new customfield to product for each layer and type selections and image for it.
It's hard to explain with words, so please look at layout images and check DEMO page!