You can now purchase sets of pre-made covers. Each set comes with an ebook edition and a paperback edition. I've debated for some time now doing this, but I finally gave in to myself. Each set, once sold, will be removed and never re-sold so that each customer gets what they're paying for plus the knowledge that they won't see their cover on another author/writer's work.
Pre-made covers cost the same as custom work, $40.00 for the set. The difference is a pre-made is quicker to get modified and given back than what it would take me to do a customized piece.
As with custom work, I ask that I be given credit as the designer for the cover inside the copyrighting page.