Even better then eating it, jello playdough.
7 Great DIY Outdoor Games and Activities for kids and adults
Ball pit using an inflatable pool for home
Snow painting is a fun and skill building winter activity! As kids aim the "snow paint," they'll improve their fine motor skills and hand-eye coordination! http://learningexpress.com/skill-building/index.html
Homemade Snow Paint, a great gift for any child.
Kool-aid Snow Paint- vibrant, simple to make, very inexpensive, and smells amazing! SO FUN!
Snow paint for winter fun - Food coloring + water = snow paint