There are a million ways….
from your own photos. Just a woods with a creek photo, say, then blown up to the smallest side being 3600 pixels (or whatever size you’re after). Backgrounds can be blurry with the resize. Crop to,size. Put your zip line or camping photos on it.
a photo of a parking garage wall, a stucco wall, an elevator door…..resize, place on a colored paper and mess with the blending modes, maybe “multiply” then move the transparency slider to 40% and see what it looks like. You can use packing peanuts, a park bench back, old wooden storage barn, peeled paint fence or wall. I used my wood floors, and also a painted wall where you could see the puckers of the paint roller. As long as the “original” is over 12” square, it will work. (I use 16” as my parameter)
photo of Kraft paper, waxed paper, butcher paper, florist paper, cardboard box panel, packing paper (even if it’s been crumbled). Then add color. And blend modes, use those sliders!
as long as it’s for your own use, these are sometimes popular:
scan or take a photo of newspaper, wrapping paper, wallpaper.
When you have it, start looking at textures. effects-texture, texture. Add one that is subtle, but not too subtle. I find this the trickiest.
Post your results!