Pick a flower or plant and lay on top of a small piece of clay and use a rolling pin to make an imprint in the clay. let it harden. Paint. Add a magnet to the back.
Wood joinery, from a page with lots of good carpentry information.
12 Ways To Add Texture With Tools You Already Have | WoodworkerZ.com
If space is an issue, consider a vertical garden pyramid tower. Complete how-to from RemoveandReplace.com here.