Maybe you want to shoot it from below so it is framed by sky.
Thermofax screens burn best when there is high contrast - NO shades of grey! Some phone camera apps can turn a picture into a sketch-like image and that may help you to decide if you have taken the photo as you want it to burn on the screen. Flora is a great way to start using photography for your custom imagery. It is plentiful and stays still when you take a picture. :) Don’t forget to look for design sources from winter that still linger in the landscape as you walk.
If you can pick your flora, you can press and then photograph it or lay it on a piece of plain felt and photograph from above. Using the solid background keeps you from having to edit out a lot of clutter in the photo.