Okay, here's a few that I've tossed around myself.
Catering to the hunt club set.
Equipment and agricultural services. This would be for green fields and the like. Could range from just being the local guy with a tractor to full on services of soil management and planting of year round crops. Along those lines a bush hog and flail mower get you into habitat management for ground nesting species like quail and turkey. Specialty tractors like one of the italian two wheel or one of the sub compact reversibles could get you into areas big equipment can't and might be a niche. I'm seriously considering purchasing a Grillo 107D, Grillo 107:
http://youtu.be/zJV-LuNEAko, garden tiller that takes PTO powered implements for the garden but also for yard and lot clean up for habitat management.
If you can make contact with hunting clubs they all have critters but the rednecks will burn the place to the ground before paying BUT most of them Bubbas will crap themselves over a snake and you got velvet tails, saddlebacks and ground rattlers plus moccasins. Let Bubba know your crazy enough to go looking for snakes you got your in for the critters. Take it a step further with maybe a maintenance program to look in on the place during the summer.
Who knows it might work. If it does let me know and I'll pack the truck.