Start a collection based on the first found object you see on your walk, whatever that is. You decide what the connection between the objects is (can be based on shape, color, size, etc.)
Since I'm back in the suburbs, there isn't much to be found that isn't nature related. Thus, the first thing I saw when I walked out my door was a downy duck feather. Perfect! With all the nature in my yard, this should have been easy, a variety of feathers to be found. Wrong! I found very few feathers over the week. A few from my favorite bird, the Blue Jay, were the most exciting find. I waited all week for Picasso the Duck to drop a loose feather that was on his back but as of today, he is still holding onto it! I did manage to find two large duck feathers and several of the super soft downy feathers including one that was all white, my favorite of the collection.