I LOVE Autumn. Once the leaves start changing I'm in awe. But always wary that they are not going to last long. A couple of year ago- we collected the best coloured leaves that we could find and stuck them in the laminating machine to try to capture their beauty for a bit longer. We put about 5 leaves in each A3 sheet and cellotaped them to our windows.
They worked really well and it meant that the kids could see the "veins" in the leaves more. They lasted with colour for 2 years then turned brown but still interesting!