thumb prints made into Christmas lights. Easy craft to do with the kids. To enhance this, I might extend the strand each year, so by the time they are older, you have a long string of thumb print lights.
this is one of the best water wall ideas i have found. really simple and let's kids turn the bottles to direct water different places. also keeps bottle caps to stop water! i am going to try this and use other containers too! would work well on wood too.