This is the classic war poster "Keep Calm and Carry On" reworded to "Keep Calm and Plant Trees". I've kept the crown at the top, and added a little forest of trees growing out of the words. It's a slightly different design, perfect for anyone who loves trees or works in forestry or gardening.
I've put this on a green background, but you can change that really easily. Hit 'Customize it' and then 'edit', and you'll be able to change to absolutely ANY color you prefer.