I've been using some HO scale tall buildings as background buildings to try and add depth. The white one is a Bachman Spectrum kit and the tan is a Custom Model Railroads (CMR) kit. I've found the Bachman series pretty available online for fairly reasonable pricing. The CMRs are high but the detail is outstanding. I have to do about 3-4 more HO scale for background and then my back drop photos can be mounted. Using black and white photos blown up to about 4'x3' to go behind the buildings, like this.OGR CEO-PUBLISHER posted: