Relax Bottle/Time out Timer. Glitter settles over time (chosen by you when you make it) to be the perfect time out timer. Wouldn't work for us as a time out timer but my son would love to watch the glitter fall.
This rainbow color sorting sensory bin is a great indoor activity for toddler and preschoolers. They work on colors, sorting and fine motor skills. A hidden way to make color sorting a self motivated activity!