The new accessory for photo booths seems to be these chalkboard bubble signs.   Which I absolutely adore, I think guests can go crazy with capturing things on camera with these.  Definitely takes the photobooth and steps it up a notch.

I came across another great idea to build off these bubble signs on Hello Lucky this weekend while catching up with my google reader.  They are Chalkboard Bubble Pins, and they complement the photobooth signs quite well.  They are a little pricey to be used as escort cards for a mass amount of guests, but you could get these as a variation to the photobooth signs to add dimension, or have one floating around the reception that the photographers can catch throughout the night.