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
Rain Bottle ~ fill a dry empty bottle with a box of toothpicks. Add rice (uncooked) to the bottle leaving an empty space of about 1 inches at the top. Seal the lid. As you gently turn the bottle, the rice falls through the toothpicks, sounding like rain.
For Cinco de Mayo in Kdg. - Plastic egg maracas - plastic easter eggs, fill them with what you want (candy, beans, etc.) 2 plastic spoons, wrap in colorful duct tape or plain masking tape and hand decorate.