Any chance that you have too many toys out right now? If you remove one or two of the large items, and rotate the toys every couple of weeks, it serves two purposes: a) frees up space and b) the kids get less bored with the toys available if they are switched out.
When it comes to layout, I second playfelt's suggestions. Also, take a look at the furniture surrounding the area. Perhaps it can be rearranged to feel more "open"? Put all the toy stations against the wall, and lay down a large carpet, or use those foam interlocking pieces.
Good luck with your coming interviews!!