Custom Image Selection

-- HikaShop version -- : latest
-- Joomla version -- : latest
-- Error-message(debug-mod must be tuned on) -- : none

I sell custom printed products. I'd like to create a way customers can select an image they want printed on it. For example, they purchase a product that allows a 4"x4" image, so they can select an image. This particular size image has nearly 150 options alone. Since I inventory the product, I don't need to inventory printed image since I make them as I sell them.

Knowing that, is there an easy way to allow the customer to select an image without having to create a variant for every product? The only two ways I thought it may work are...
1) adding a variant for every product (which would take a long time)
2) making categories based on printed image sizes and creating a custom field that allows them to choose only the image folders for that category. I can't seem to find a way that might work with images though.

Can you tell me what the easiest and best way to accomplish this is?

Awesome... I was 90% there when you wrote this. Thank you!

I got the images to display with radio buttons. Is there a way to display them as a dropdown or other method that won't take up much room? Maybe even a small window that scrolls them as radio buttons if no other way? I'd rather not have 150 radio buttons on some of the products!