Working at the carwash

In my attempt to add in some art projects this summer I came up with what I thought would be a really fun one.  I cut up sponges into different shapes (I even tried to make one look like a train) and thought the boys could dip them in paint and then sponge paint onto colored paper.  They quickly decided to change the project completely.  Their idea was to paint cars and then wash them off with the sponges.  All the while we sang "workin' at the carwash".  It was super fun and SUPER messy!  It occupied them for over 2 hours!