Yeah, I thought it needed more colour too (in fact, I worked on it for a few hours and a 1/3 of my vision was red for a few minutes after getting off of the computer because it was extremely bright). I had intentions of making the sign blue and red, but that was dropped because I thought it looked pretty good.
I tried to make the mini-mart look good, but I'm not really good at making stores out of bricks. :/
Thanks for the suggestions, though. I'll definitely consider some of them next time I start working on this.