Yeah this
there are some really nice covers here http://www.neogaf.com/forum/showthread.php?t=442713
and over at the cover project
Better off using cover project than the custom cover thread, that thread is mainly for console gamers. Though I have been contributing PC covers over there for a little while.
As suppa said, use the Cover Project. Here is the site: http://www.thecoverproject.net/
I have mine in DS cases and printed off covers from the project. My only regret is I got some used cases from ebay that were in horrible condition.
I printed my SNES covers off from there as well: