Before we make a contaiment out of it (are we going to make it for 4.1 with the freeze?), and we're able to choose it, at least add an option to make folderview's background transparent, so it doesn't hurt your eyes. ;-)

Not sure about what doing by default, but I guess I'll keep it opaque (as it is now), so people understand that is a plasmoid.

ACK'd on review board by logixoul.