In a bowl, mix the flour, salt, and warm water. Knead it with your hand until all combined.
Use a rolling pin and roll it out flat.
Use a tree cookie cutter and press it into the dough. Dana cut a star shape out of cardboard for tracing the star toppers (but you could use a tiny cookie cutter).
Have the kids press their fingerprints on the tree. Poke a hole on top of the tree and star with a pencil or straw.
Bake at 250 degrees for 3 hours, flipping halfway.
Let them cool for a few hours then use acrylic paint for the star. Have the kids dip their finger on an ink pad and press it into the indents they made.
Use the sharpie and draw string lines between all the fingerprint lights.
Write the year or name and seal with mod podge. Tie a ribbon and you're done!