All the ones you see in this thread are designed by Simon for the plate but then the case is created by Jeff Whiley. (jeffrey.whiley@ntlworld.com ). If you are not looking for a stamped case you can have him create you just plane cases and order nameplates from somewhere and adhere them yourself. There is a thread for all aftermarket slipcases created so far in the wiki.
Also if you do want a plate you can design your own and send it to him and he will get it created. If you go this route you will have to pay for plate creation and case but for some books it is worth it. Also you can do a poll and see how many people are interested in the plate. If you have enough people he will sometimes make the plate for free since it will get a lot of use.