You might check out some of KSF's sheaths from Sharpshooter sheath systems:

http://www.knivesshipfree.com/Sheaths


If you have the combo set some of their sheaths will piggyback with a smaller knife sheath.

For a single knife I really like the Bushcraft style sheaths that hold a firesteel..........................DJ


Remember this is all supposed to be for fun.......................