[UFsigmakappa]

When I rushed the house I'm in now, they sang as we walked in in just the last round. It was powerful, because they felt it too and emulated it.
If you dont want to sing, humming can work then do just one verse, maybe? Its hard to completely change recruitment. Also, we stand around the room while they file in. Surrounding them - not as creepy as it seems, then the speaker(s) can be at points of the shape or randomly around!

Decoration-wise, I dont know what you do, but we had an example done from nationals for prefs round. Its a triangle done in white fabric with lights below it and rose petals on top in the center of the room (not ritual, obvi). It looks amazing. I'd say classic is always best (esp because you can continue to use it for years)!

I, myself, havent recruited yet. But I figured that from what I've seen so far I can atleast give you a (possibly) good idea!