I filled the pool with red, yellow, and blue Legos and provided 3 tubs of colored water to match. My little girl is not into sorting unless there is a practical purpose, so I put a bit of soap in the colored bins and told E that the Legos needed a bath. The red Legos needed to go in the red bath, blue Legos in the blue bath, and red in the red. To add a bit of fine motor work, I gave E a net to catch and transfer the blocks with. I also spread the colored bins of water around the yard for an added gross motor component.
She really enjoyed this activity and it was a fun way to sneak in some sorting work!