A few years ago I was in need of a gas station for my layout. At the time I was into postwar trains and wanted something that was sort of realistic but still not a true scale model. I eventually went the cardstock route and drew up a little station that was a cross between a vintage rural station and a Marx tin plate gas station from the 1930's. Since then I have progressed from postwar semi-scale to tinplate fun-scale. lol
I have been reworking the layout to reflect a more toy train vibe and I finally decided to redo the gas station. Working from the original drawings I back dated (simplified) the details and altered the color scheme a bit to look like two color lithography. I did however experiment with some "yellowing" of the white areas on some sections of the building. Also added fake tabs to the roof
Here's some photos. The red roofed one is the new "old tinplate" one...
Here's what the original Marx gas station looks like. I don't own one. I snatched this photo off the interwebs.
Have you seen these downloadable kits? They have a decent rendition of the Lionel bungalow and the AF Lewis Park station. 
