$5 12"/12"/.35" polished granite tile found at HD. Found the image here here with some manual adjustment in GIMP. Took about 1hr 40m all told and I’m really happy with the results. Tried earlier with masking but couldn’t finagle the settings to make it look good.
Super heavy and awesome looking! Inspired heavily by Map on slate - next up is exporting shape files in tilemill and getting more modern road maps.