Most people are unaware of exactly how many types of terrain there are in the Warhammer 40k main rulebook. They seem to forget that there is a plethroa of other types besides hills, ruins, and area terrain. Let's review a couple of the lesser known ones....
Ammunition Dump: Any model within 12" of an ammunition dump can reroll to shooting to hit rolls of 1 and provides a 5+ cover save.
Comms relay: Provides a 5+ cover save and let's a player with a model within 2" inches reroll reserve rolls.
Fuel Reserve: Provides a 5+ save. After each succesful save roll a dice. On a roll of one center the large blast marker over the model making the save. On a 1 place the large blast marker over the model making the save. All models touched by the blast suffer a S3 AP- hit.... the fuel barrels exploded!
Imperial Statuary: Armies of the Imperium gain the fearless special rule while within 2". If you're behind it, you gain a 3+ cover save.
These are just a few of the terrain types that a rarely used that may spice up your game... check out pages 104-105 for more!