It was lots of fun and we had everything on hand. All you need to make eraser dot rainbows is paint (all the colors in the rainbow), paper, and pencils (with flat, unused erasers on top).
I used a pencil to draw light rainbow lines on the paper as a guide for the kids. Then, they dipped the erasers in the paint and dot painted along the guide lines using the colors of the rainbow. That’s it!!!!