You don't need a pattern to follow. If this is a wood stand paint it now so it'll cure out. Just paint the whole thing real heavy with the first coat for weather protection. Then just open 2 or 3 cans of mixed colors. I like a black, grey and a brighter green. Also maybe a small can of white. Just start and dob or slash streaks across the stand. You want to break up all horizontal and vertical lines. If you have major pieces joining at intersections you want to hit those two. You can get different shades by streaking another lighter color or a little white over the streaks you just made while they're still wet. Make sure you do the reverse sides too so there are no solid lines. Big streaks and blotches are better than small. On something like a 2x4 you should make the blotches about 1/2 way across the thing and alternate sides as you go up. Throw in a couple small light streaks of white or light grey streaked while wet with white. Don't try to make a pattern repeat. Just whack it here and there and everywhere. To see where you're good and where you may need more just stand back a ways and squint at it.

If it's a climber or something like that I make the platform area all one color on top and maybe a little light. It kind of catches your eye and subconsciously gives you limits to walk on when you're up in it. The leaf cutouts are pretty and all that... but really a lot of unnecessary work with little or no value. The key is to break up the verticle and horizontal edges. A little streak of red or rust here and there helps in fall woods. Again, just whack, streak, blend while wet etc. If you get a bad look in a spot just do it again.