We are fortunate to have a yard full of trees, and lots of different ones to choose from. A couple of days ago I went out and grabbed some leaves to make a leaf identification sheet for M.
I simply arranged them on the scanner and copied them onto a piece of cardstock:

Then I labeled them (I only picked leaves that I was sure of, but I clearly need to learn a bit more about the trees we have. There are several I can’t identify).
I gave the sheet and the leaves to M to match them up as I told him their names:

I hope to have him gather some leaves on his own and use this sheet to identify them some time soon (he’s been sick all week, and stuck inside, poor guy!).
Then we did some rubbings of the leaves:

We’ve never done rubbings of any sort, although it is something I’ve wanted to do for quite a while. M enjoyed seeing the magic picture show up. ;) I hid the leaves under the paper while he was out of the room. When he started the rubbing he said, “I’m making a tree!!”.
Finished products (top pic is chalk, bottom pic is crayons):

Have a beautiful day! :)