What's the deal with stairs? Shaded, unshaded, arrows, no arrows?
Shaded stairs are paths off the current level (up or down). Unshaded stairs are elevation changes within the current level. Arrows indicate direction, and stairs without can be interpreted as either up or down staircases.
All Tile of the Week images are free for private use. You can download the images above using right-click / save as. Each tile is a 100px per five-foot square image, sized for compatibility with Dungeons in Blue geomorphs. The entire Tile of the Week Collection is also available as a pay what you want bundle if you're feeling lazy.