I don't have a barn yet, and Mellow has taken over the tractor shed to the point that my other two won't even try to go in it (Even if he isn't there). My solution? The space under my play room, of course!
I just rigged some lattice board across the entrance so they'd stay put (Duncan has to follow Ginger everywhere). They were nervous at first because the ceiling is rather low, but they've settled in nicely.
Mellow refused to stay at the shed without the other two, so I put his hay outside so he could be close. He's got such a thick coat I don't care if he gets wet.
What crazy/ silly things have you done for your horses? Share a picture if you have one!