Buy a Bucket Boss (a portable tool belt that hooks on a bucket) from a building supply store for about $7, put it on a bucket (duh), and add the kids' art supplies small games. Inside holds big stuff like paper and all the pockets on the outside are for pens, markers, glue, scissors, small games, etc. - Click image to find more DIY Crafts Pinterest pins
Another Pinner said: "This kept my 2 year busy for an entire hour and my 4 year old busy for 2 hours! YAY! Drop vinegar tinted with food coloring onto a pan filled with baking soda. Sheer minutes of colorful fizziness!!