ALPHABET (R) (W) Free printable Road Letters. Use your child's love of cards to encourage him or her to learn the letters of the alphabet! This is a great tool for helping kids practice writing letters with the correct stroke order.
I have two variants of this. The 'things from nature' basket which just has shells, wood, stones, feathers etc and 'natural objects' basket including many items from here. This was an easy place to start.