I used the 'mod' for the colored mushrooms and love it. Then I thought of having good mushrooms and bad mushrooms.

I think some mentioned already mentioned to have a child pick a mushroom in their vicinity without you having to drag them there. My suggestion is an add-on to this thought. Kids see a mushroom and pick it, the good one s and the bad. The bad ones however when placed in the food bin make everyone ill. Or just makes the child ill, gives them poison ivy. To stop the kid from putting it in the bin you'll need to catch them in the act and pick them up so they drop it.

Not easy to do when you have a dozen kids all running around and as many adults not wanting to do their assigned jobs .