It would be nice if the barrel in the fantasy level were available as a prop.
A throw pillow, resizeable if possible and a simple resizeable cube/box would also be useful.
Personally, those additional props with the new custom skinning could keep me happy for a pretty long dry spell while YV2 is under development.
Other than that, it would be nice to have every level specific asset as a standalone prop as well. Like the items in the gym room, or the bar stools, etc.. For now, extra things that you could put into the environment to make scenes look more unique, or home-y, could go a long way. Even if they are seemingly boring props.