The basic ProjecTile screen (It can be as large as you want, but I made it small for the screenshots)
Right-clicking a file on the list brings up a list of file management options:
The discoloration in the viewing area is a 'negative' of a single tile. This feature gives you an idea of the tile's original size. Also shown, the set wallpaper toolbar menu:
You can export to a larger file. The original will be tiled over the surface of the new file.
