Destination X isn't all Ultimate X matches. Lockdown you may be thinking of, with all Six Sides Of Steel Matches.
But if your question is actually if you WANT to do all Ultimate X matches, what variations you could use, then.....there's no much. lol
You have Ultimate X. You have that one all Steel X stipulation that AJ Vs. Rhino did a while ago. Can't remember the name. You could have just plain ladder matches, or Full Metal Mayhem, or the Xscape Match, maybe a House Of Fun match. But not much else.