Foam-erator

I saw this great idea from Betz White. This is my kind of project. Materials on hand, total assembly time less than 5 minutes. I don't have a picture to share of my kids using these "foam-erators" but they worked just like the ones on Betz's blog.
To make your own, slice the end of a plastic bottle off with an x-acto knife. Cut a washcloth section big enough to cover the open end of the bottle. Cinch it up with a rubber band. Dip the bottom of the bottle in water then a little bowl of bubble solution (or bubble bath or dish soap). Blow gently through the top and create a long foamy bubble trail.
Fun indoors (bath or sink) or out!