Sponges are one of my favorite "pediatric occupational therapy" items in my therapy bag! There are so many therapeutic activities for basic kitchen sponges! Simply cut the sponges into blocks or shapes of various sizes and watch any child enjoy making creations. Take a variety of brightly colored sponges, and create a stack in a particular sequence of colors/shape and then have the child re-create the stack.
Another fun activity that is great for visual perceptual skills is to make a variety of worksheets with different shapes that they child can place the sponges on top of to create a design. This is basically an inexpensive tangram game that will challenge a child's visual perceptual skills. The sheets can range from basic to more complex in order to increase the challenge based on the child's skill level! So go to the dollar store and pick up a package of sponges and get ready to have some fun!