Washing babies (and baby clothes!) in the water table. This actually fits well under "dramatic play" too. What a great idea to incorporate clothes washing too. Apparently it attracted both girls and boys. fun for our classroom
Gross Motor Sensory Play Ideas for Sensory Processing Play
fairy soup - happy hooligans - outdoor sensory activities for kids. This is also a free activity you could consider mentioning to parents; a trip to the local park and then play at home. Also called a messy mixture, or "perfume making"