It would be neat to run a McCLIM version of something like StumpWM. In fact, it looks like this has been discussed before, but was mostly dismissed because McCLIM was fairly inactive. But McCLIM is active again.

I have some reasons why I'd like to play with McCLIM, and I'll also note that having a McCLIM based WM would bring a GNU/Linux desktop to be much closer to something like a lisp machine design. Which is appealing...