Believe it or not ACU works pretty well in the scrub oak. The old woodland BDUs are pretty decent in the woods and three color desert works in arid environments. All three paterns are available in large quantities for a pretty low cost.

I've got a ton of stuff in multicam, ACU, MARPAT (desert), green and tan. At the end of the day your terrain is going to dictate what works best to hide from people. Sometimes you can pick a pattern that is going to be great. Sometimes you have to hedge a little.

If you're hiding from animals, just learn how to move carefully and sit still.