This is something I've conjured. Of course, nothing's been materialised yet, but I'd like to see what you all think of the idea.
Basically, it's all about art. You'd create five or so levels in Lemedit, each with the aim to simply look good. How you do this is up to you. Perhaps it's the way you use the terrain to create pictures? Or maybe it's the formation the lemmings walk in? It would simply be up to you and your imagination. The levels wouldn't need a solution (Perhaps not even an exit, there's always SKIPLEVELS), but you could perhaps give the player insturctions on skills to use to give the desired effect.
So who would be interested? And who would compete?