I did a lot of flower pressing as a kid. I had one of those kits with the butterfly screws, but you can also preserve flowers this way by pressing them between the pages of a big heavy book (one you don't mind marking with little curves of flower juice.) What's remarkable is that the color stays when you press. them, whereas if you hang them they shrivel up and fade.
I'm in the middle of packing for a move right now, and things keep sliding out of books that I've put there for safekeeping. Photo booth strips, old sketches, greeting cards and yes even a flower here and there that I don't remember tucking away in the first place. Having a bad memory can be thrilling.