Nice pictures! They certainly look like unintended solutions.
If you're looking for more 'wrong ways to clear levels, just because they're wrong', you could try some of the Original Lemmings Levels. I remember that Taxing 10 and Mayhem 25 had some clear backroutes, and that there were ceiling routes for Mayhem levels 7 and 17. There might be more though, so good luck in your searches!