As you might imagine from this artpack's name, it's a set of modular components that you place on the background of your choice to create a sewer system layout.
All the tiles in this artpack were created in the same style by the same artist (Keith Paul, aka IronDwarf, who many of you know from the Dundjinni User Forums). The components are all high-resolution (122 pixels per cell), so they won't pixelate even at full zoom in BRPG.
In addition to sewer tunnels in a variety of configurations, the artpack also contains stand-alone elements to further customize your layout, audio clips to set the mood (and creep your players out!), and even figure tokens for commonly-encountered vermin (i.e., bats and rats). The artpack contains 104 graphics and 19 audio clips (most of which can be set to loop continuously). This is a convenient set both for GM's who like to improvise on-the-fly and those who like to create elaborate layouts well ahead of game-time.
You can download the artpack here:
Component Sewer Pack 1
Installation instructions and other important information are in the ReadMe file which is included in the download.
Note that players will need to have this artpack installed during sessions where the GM will use it, and everyone must be using BRPG v1.3e or higher.
The content in this artpack may be improved and/or added to in future releases (perhaps due to user feedback and requests for new components).