Creative play ideas that incorporate nature study abound all over the internet.  Here are a few links to get you started.   Click on the source link below each picture to go directly to each site.

Objects found on a nature walk become nature-based crafts.

Source: momenttomomentdk.blogspot.com

15 Crafts Inspired by the Great Outdoors

                                                                 Source: blogs.babble.com

Craft Idea for Toddlers

Make a Bug!

33 Nature Art, Craft and Play Ideas for Kids