As part of our Halloween Week we did this leaf craft to go in the window. I wasn't sure how it would turn out, but was really happy with the results.
We started with a sheet of clear contact paper I taped to his table. I printed a leaf outline I found with Google, traced it onto construction paper, and used an Exacto knife to cut out the inside (much easier than it sounds, I was a little apprehensive).
I cut a bunch of squares of tissue paper for him to stick inside the leaf.
He may have dumped one of the bags... Luckily it was after most of the leaf was covered, so they didn't all stick.
I covered it in another sheet of contact paper, cut it out, and hung it in the window! Tada!