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I purchased a Prayer Cube as a Christmas gift for each family in our children’s ministry a couple of years ago. Each side has a short prayer, usually very formulaic.
The draw in using these isn’t so much in saying the specific short prayers, but in getting your kids involved in praying. Once you’ve started with the prescribed prayer, you can move on to other things–such as praying for the people you know or other needs throughout the world.
My kids enjoyed having something tangible to use when praying and I got comments from other parents whose kids enjoyed using the Prayer Cube, as well.
There are many versions of this cube, with differing prayers and focus, so you should be able to find one which appeals to you.