Yes, I dusted off the Handbook of Nature Study and actually put it to use.  I thought the section on trees would be the easiest place to start, having a deciduous woodland in our back yard.  She describes how to make leaf prints using printer's ink and rubber rollers, neither of which I have.  I do, however, have washable black paint and a sponger roller brush, so I sent the kids into the woods to collect a variety of leaves so we could give it a try.

Note the crystal cake stand as our inking glass (after I cleaned the dust off it.)  I suppose you could use a glass cutting board as well.  First roll the paint onto the glass.  I thinned the paint a little; it actually works better on the thicker side.  I used a defective bottle of Tuxedo Black paint--more like teal green, eh?

Put the leaf/leaves on the inked glass and then roll ink onto the leaves.

Carefully remove the leaves and place them onto a sheet of white paper--we used bright white heavy weight (28) printing paper.  Be careful to have the leaf land without wrinkles so you don't have to adjust it and smear the paint (this was difficult.)

Place another paper on top of the leaves and run a roller once over the leaves.  I used a pizza roller to do this, though a rolling pin would probably by fine, too.

Lift the sheet, remove the leaves, and you have two sets of prints!

After three kids each take their turns, you have lots and lots of prints:

I think I'll have ds#3 find the matching prints.  I will hole-punch them and put them into a nature notebook.  We're off to a great start!