So in preparation to run some 5150: New Beginnings I have gone back to creating some modular urban 15mm terrain. Each tile is 6"x6", allowing a variety of streets and blocks configurations. The buildings fold flat. The files may be obtained on this thread of the Cardboard Warriors forum. Here are some pictures of the results, printed in economy mode on gray paper.
A closer look on one of the buildings. While the streets and sidewalks look good enough in economy mode, I might end up printing the buildings again in normal setting. On the other hand, this "washed out" look makes the minis stand out.
Here's a shot with a few miniatures (from Precis Intermedia) printed in reduced scale to be used as 15mm. The tiles are connected to each other through a simple system of tabs. The buildings are slotted into the tiles so that they don't move around too.
And another shot to show a bunch of minis on the board, to get a better sense of scale. For a proper game, I think I still have to print some more tiles, to get a 2'x2' area at least. For learning the rules, this will certainly do.