Don't wanna make crafts with your leaves? I love this simple display idea for your finished leaves, from Art Bar Blog. The post I link to is about the Thanksgiving Day craft on the table, but check out the leaves above — they're just affixed to the wall with bits of washi tape.
I like a project that forces you to finally print out a picture from your computer, dammit! (Just me?) Jennifer at Teach Them To Fly photographed her students as they pretended they were the wind blowing the leaves through the air. She printed out the portraits, and had them add real leaves to the scene. Cute!
Leaf-rubbing is a classic children's craft, and you can do it anywhere, even where the leaves stay green year-round. This photo is from Edventure's exploration of the art of leaf rubbing using different materials. The post includes some handy science facts, too, so you can lay some knowledge on your young subjects as they rub.
This leaf guy from Mrs. Karen's preschool class is the greatest, except for the other ones on her blog, which are also the greatest. (Kid art, man. It just rules.) Pretty self-explanatory idea, here: Glue leaves and other nature-walk bits and bobs to a piece of sturdy paper to form a person.
There are lots of variations of reverse-print leaf artwork to be found online, but this one has a few unique touches — and the finished product looks great. Kids Craft Room made this fall window art using contact paper, leaves and paint. There's a handy how-to, with video, on her blog.
Wallflower Girl makes fall leaves glow by attaching them to fairy lights (what I usually call Christmas lights) with glue. She preserves her leaves using the waxed paper/ironing method, and they look great. (She doesn't mention it, but always put paper between your iron and the waxed paper, or you'll wreck your iron.) I like projects that involve illumination during the time of year in which the days are getting shorter.