We used bird seed as our sensory material, its so relaxing digging your hands into seeds and although it does make a big mess its fine for young children as its harmless to eat.
I gathered a collection of items from around the house, some magnetic and some not then buried them all into the seed.
I wrote on two pieces of paper "magnetic" and "not magnetic" and the kids used their new magnetic wands to search for the buried treasure and categorise them.
Mason enjoying the soothing seeds. Both kids ended up in the tub feet and all and seeds were everywhere but it was a great activity-maybe outside next time!