When the leaves on trees are just starting to change color in the Autumn, try collecting them and arranging them into shapes with a spectrum of colors! The above example was created with Maples leaves by Flickr user Mr. dale.
(via Laughing Squid)
Image credit: Autumn Spectrum 10/10/10 by Mr. dale
Just to have them blow away when adding the last leaf? No, thank you! :-P
Andy Goldsworthy has made a career out of this. I have a couple of his books, it’s pretty amazing what you can do with this sort of thing.