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.
And since you took a peek at this, here's a special discount link (50% off) on the latest Dungeons in Blue tile set, Tunnel and Cave, which contains sixteen worked tunnel to natural cavern transition tiles in assorted sizes.