ST has supplied a bounding box for her Stolo project. Unfortunately it's huge; but I rendered it with zoom levels 10 through 16, and it took only a few hours, generating 47,762 tiles. That may not be enough detail, though. Relevant segment from
render_tiles(bbox, mapfile, tile_dir, 0, 2, "World") minZoom = 10 maxZoom = 16 stolo = (-122.508545,48.789676, -121.322021,49.378797) render_tiles(stolo, mapfile, tile_dir, minZoom, maxZoom)
I've now set it going again (using screen) to render the next two zoom levels (17 and 18), and we'll see how long that takes.