Make up a litre or more of nesquick or milo and milk (I put an extra teaspoon per cup), pour this into small freezer proof containers and freeze them. When they are ready, use a teaspoon to scrape it out. My kids love them. They last longer than ordinary ice blocks, plus you know what goes into them. You can also use cordial or fruit juice.
Cheap Homemade Toy Blocks for Christmas