If there's more than one picture in the folder, what should happen?

I like the idea but for now, there's a (less convenient) workaround; right-click the folder, choose Image, and select the texture icon to drag the picture you want onto the little interface that pops up. There's also a snapshot icon for taking a picture for free to add to the folder. These pictures do appear on hover, and they let you choose which picture you want to use