Taxus "Hicksii" could easily fill those dimensions you've described. It can get much bigger, you'd have to clip it back every year. Another option might be a trellis with vines, depending on how much sun it gets.

Hippy, propane is a liquid inside the tank. Doesn't matter if it's 1lb or 1000lbs, it's always a liquid. The pressure inside the tank, while it is full of liquid, is always the same in every tank as long as they are the same temperature. In the 50 or so degrees in my garage, the vapor pressure in the propane is 78 PSI. Doesn't matter if the tank is 1lb or 1000lbs, if it's 50 degrees, it's 78 PSI. Look up "propane vapor pressure" in google. If anything, I would guess it's getting LESS pressure with the adapter hose, because everything I hook up to it seems to have a slightly decreased output. That makes complete sense, because with any compressed gasses longer hose = less pressure. As for refilling the tanks, that's probably what I will be doing if I don't get the adapter to work. It is most definately safe and not illegal. If it was as dangerous as you make it sound credible companies like Mr. Heater would NOT be selling them to the general public. Of course coleman tries to trick you into thinking they are illegal to refill - they want you to throw it away and buy another! If you refill the tank before it is completely empty the pressure never changes, thus, there are no metal fatigue issues. Sure, they'll wear out eventually, but they will easily last 10 or more fills. Under no circumstances will I continue to pay $2.50 for a QUART of propane.

My installer first checked to see if I had the proper "regulator" which I didn't, I had to order it from Northern Tools.com. Then he proceeded to install it with a Cutoff switch & bypass switch 10 ft from the generator which he said was CODE in my state.(My Gen/set shares the same propane line with the gas fireplace so you may not need a bypass. My tank is 150 ft from my house near a service road by choice.) You might want to check with your County/State dept of Planning & Permits. I had my gasfitter's work inspected by the county; after it was done.

I am beginning to think really subtle camo - using the Dijon mustard tone for the top, and for the "face" that faces the road. No need to repaint everything! (Just about everyone on FB wants me to go Yellow Submarine -- and while that has a charm, it might just be a bit too cliched...) Adding little bits of creative interest in the camo parts at the bottom of either side of the tank is something I'm mentally toying with... AND, playing with the bushes, shrubbery and trellis will work there. For those who wonder, the yard does not yet have much in the way of whimsy -- right now the house is in the final stages of construction, so a lot of potential in several directions. I have several attractive rocks (New England!) the builders unearthed to set around while the equipment to move these is available. There is also an old abandoned rusty wagon wheel that I want to put somewhere. I can't move it myself, and it IS sitting in a patch of poison ivy. There will eventually be a chicken house and a chicken tractor. So, decor will also be "farm".