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 /home/maptiler/stolo/generate_tiles.py:

    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.