Cheap and easy messy activity!
Toilet paper (we used 1 and 1/2 rolls)
First rip up the toilet paper in a large bin, then add about half cup of shampoo and water. I am not sure how much water we added but you want your mixture to be like goop. When done split the mixture into different balls. I pressed the mix together tightly to make ours, then add in food coloring to each individual ball. Note this did stain my hands a little but when it was done mixing it did not stain my kids.
I highly recommend this as a outside activity as it can get pretty messy. My son ended up adding more water and shampoo and making lots of bubbles.
He played with his hands and feet! He said it felt smooth and squishy. Thanks to the shampoo it also smelled amazing!