Clear contact paper (as a side note, this is not as easily found as I was anticipating. When looking for clear contact paper, do not go to your local grocery store, drug store or Staples as I attempted. After 5 miserable failed attempts, I finally found the apparently illusive contact paper at Home Depot of all places), items from nature: grass, flowers, leaves..., string or ribbon, a hole punch, and a basket to collect your nature items.
While outdoors with your children offer them a basket and often all you'll need to do is take a step back and watch. Children are natural collectors of beautiful, natural items and will make quick work of finding things to place in their baskets.
Once their baskets are full, this is where the clear contact paper comes in. You may now begin placing the natural items directly onto the contact paper. Flat items work best for this. Izzy's little acorn cap would be a bit challenging to use in this application.
If you are working with young toddlers as I was here, they will not only enjoy sticking items to the contact paper, but will want some time to simply enjoy the tactile experience of the paper itself!
Now that you have filled one piece of contact paper with your beautiful things, you can either place a new piece of contact paper on top to sandwich the items in between, or you could simply fold the paper in half as I did here.
Once your collage is complete, there are a variety of applications for it. If you made a small collage, punch a hole in the top, put a piece of string through and instant book mark!