I think "sharing" would be a simple enough theme for three-year-olds to understand and portray. It could be fun if you used colorful props they could share (i.e., hand to each other) during the dance. Maybe you can make very cheap tissue paper and pipe cleaner flowers they could even share with the audience at the end of the dance. These cost pennies, take only 30 seconds to make, and are very colorful (or they could be made in a color complementing the childrens' outfits).
They are three. They don't know what a theme is nor a message. But babies like to count up to their age. Find some music that is in 3/4 time. Then do every thing in groups of three. 3 crackers on each of their plates. 3 cracker sized pieces of cheese to one side. Let them put the cheese on the crackers as they count to 3. Get 3 balloons for each baby (not the floating ones.) Put them in a closed off spot but where they can reach them on the floor.
Let each baby go and get 3 balloons, one at a time, bring it to you, so you can tie a string to it. Then they can drag them around in a circle over the carpet while "Dancing" 3 times in one direction, then switching. Put a coffee table in the center or footstool to dance around. When you serve cake cut each of their pieces in to 3 smaller pieces. Use a small spoon to make 3 small scoops of ice cream on each plate. = 1 regular scoop. 3 small balls to play with. Sit on the floor in a circle, push all balls across floor. Any other "groups of three" will work.
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