I have a question. What would I need to do to have a image overlay for sold out products. This basically should cause the image to be "grayed out" (so a gray overlay with opacity at 60% or something like that), so that you can still see the image but it is clearly out of stock because the whole thing is grayed out. It doesn't need to say out of stock or anything like that.
I've looked for an extension that would do that and wasn't able to find it. The closest I found was doing something with css and using a z-index to overlay the image but I'm not sure how well that would work.