Had when i worked in a preschool and kids love them! I would use colored sand instead of white salt. DIY salt tray with alphabet cards. Easy to make and kids have fun smoothing out the salt after correctly making the letter
DIY: Bubble recipe and refill station. Love the idea of reusing plastic cups from restaurants as the containers. Keep the bubble solution confined to one big refill container, and no worries about leaky, yucky containers hiding all over the house!
Wood pallet sandbox, with bench seats that unfold to cover the sandbox! LOVE THIS! I hate sandboxes bc it's like an outdoor litter box for wild critters. Love that the cover will keep them out! Hubby is going to hate that I found another pallet project :D