I first heard of this monster inspired sensory bin from No Time for Flash Cards and thought we'd give it a try. It only requires four simple materials that we already had in the house.
First, squirt a lot of shaving cream into a bin.
Next, sprinkle a good size amount of cornstarch into the shaving cream and mix well. Depending on your desired consistency, you may have to add lots. We used an entire box of cornstarch between two bins. Mixing it takes some time and patience and may require a helping hand depending on the age of the children.
We used the suggested materials of googley eyes and pipe cleaners, but you might consider adding other fun stuff like pony beads, feathers, and sequins.
When added to the bin, these materials add another dimension of sensory fun. My three year old was happy just to explore the materials - squishing and squashing the muck through his hands.
The shaving cream/cornstarch mixture is mouldable and my daughter was eager to begin creating little creatures with the materials.
This was a very messy activity but it was easily cleaned as the mixture turns into a powder when dried. I just vacuumed it up!