Another excellent idea for magnetic play. A shadow box or deep picture frame can be filled with rice, sand, glitter, or other small particles, as well as interesting magnetic items. Hot glue on a backing piece of wood or cardboard if necessary, and children can use a magnet to hunt around for the hidden items.
Lego learning games - exploring Lego and play dough. This is a great activity for sensory play, imaginative play, letter recognition and sight words. This would be great to use in an autism classroom while learning long vowel sounds with silent E.