Take some plastic eggs and put in small items such as building blocks, coins or bells. Hide the eggs and then have the preschoolers find the eggs. This game helps the kids learn to become aware of their environment. When the preschoolers find all the eggs, gather the children and let each child shake the eggs, feel their weight and pass them around to the others. Then have them guess what's inside.
Gather mural paper or craft paper on a roll, newspaper, tape, tempera paint in two compatible colors, liquid detergent, four flat pans, sponge cloths and a bowl of soapy water and towels to clean up afterward. Make sure the kids are wearing old clothes first, because it is a messy activity. Tape a long sheet of the mural or craft paper to the floor and surround the paper with taped-down newspaper. Put a tub of soapy water at one end of the paper and place the flat pans on the other end. Mix the paint with the detergent and put it on sponge cloths, and put the cloths in the pans. Ask the kids to paint the mural paper with their feet. Have the kids think of different ways they can use their feet to paint. Put some music on if you like and encourage them to dance to it.
For this activity, get a very large bucket, play sand, a large plastic tub that will fit inside the bucket and some plastic animals, such as frogs, snakes and insects. Put the play sand in the bucket, dig a hole in the sand and place the plastic tub in it. Fill the tub with water and put the animals around the sand, allowing the children to play with the animals in the sand and the pond.
Bring in a box of random Lego pieces (or Duplos if the child is very young and could choke on the Legos). Let them use their creativity to build all sorts of objects without any direction. To make for easy cleanup, have them play on a large sheet so you can pull up the four corners of the sheet and dump the blocks back into the box.