Our demographics really cut across many lines, but are probably mostly suburbanites between 25-55 yrs of age - both male and female. People who love to garden, believe in the constitution, promote frugal/simple living and self-reliance, practice preparedness and survivalism, and believe in small government. They are modern patriots, who love their country and the ideals of the founding fathers, but also have a healthy mistrust of the current federal government.
I intentionally did not list red, white, and blue in the colors - but that was just because I didn't want that to become too much of a focus. Please experiment with different colors and designs, and if you find a creative way to incorporate r,w & b then go for it.
A concept that may be helpful is that of the Victory Gardens of WWII.
Some slogans I have used on FB, Twitter, and my blog are:
"The only thing a garden can't feed is fear"
"Ask not what your country can do for you, but what you can do for yourself"
"Sowing the Seeds of Independence"