hair gel + food coloring = great OT/sensory play (add in color and letter/sound recognition and spelling for older kids who still need the OT) Used this for my preschool class.they loved it.just make sure you tape them shut or they will pop them :)
Creation Fish lesson: Fill zip lock bags with hair gel from dollar store and add food coloring--blue if you want to make an aquarium. Squish the bags, add plastic, rubber, or foam fish, etc. Tape the bags and hang on window.
do on small plates for dot day Collaborative HAND ART project. Could be done with a classroom of students. Or make it a family project and have children collect one hand print design from each family member, then put them together for a family tree.