I just love Little Page Turners adaptation of the wedding keepsake tree found on Style Unveiled! She added the word "thankful" to the top of the page and created a wonderful keepsake for children and parents! Their little fingerprints will be treasured for years to come. Children should sign and date their creations! As a mom, I can tell you that this would be hanging on the wall somewhere in my house if my children had done this in elementary school!
A few of my favorite fall books that would go well with this activity:
Children just love Lois Ehlert's books!
Use these nifty pigment pads for fingerprints!
Or, make your own pads with paint and sponge pieces.