Rice, confetti, bubbles??

I've never heard of having guests toss things as you enter the reception. I've only seen it done exiting the ceremony or the reception. I'm not sure there's anything you can throw in the reception space and just leave it there for the entire reception without it being odd. It would also be odd to have someone sweeping or on the ground cleaning it up during the reception. I think I would just skip it, but you could do ribbon wands or glow sticks maybe.

I agree, and ours does too