Rescaled to 100% x 150% plus 200% x 300% then cleaned up with unsharp mask+using the unaltered tiles as guides where necessary, all credit goes to CLA, I just wanted it for my rectangular tileset fetish.

Zip includes the 18x27 and 36x54 folders with the graphics folder and files inside, replace your df/raw/graphics folder with either one and it will work as-is.