FREE dinosaur doubles printable for Kindergarten: numbers within 20. Solve, cut and paste.
5.5.5 Finger Patterns: Once double facts are embedded (and children can count 2 collections, in case they need to do that to help) they could play this game.
Flying into First Grade: More FREEBIES!!! Doubles and Weather!!!
Ideas for School
How To Integrate Nursery Rhymes Into Your Classroom Lessons - Whos Who and Whos New
Activities for the littlies
Here's a set of Numicon resources on finding doubles.
Free Addition Game for the Doubles Facts - doesn't have to be doubles. I like this idea for any facts, especially up to 5 for Kindergarten
Finally in First: Double Trouble and a freebie
Doubles Facts Freebie
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8.5.5 Addition and Subtraction to 20, Using 5 and 10: This is maybe quite a simple activity but children could also make the sum on their rack and work out the answer. They could also think of other examples to fill up the boxes.