I know I have in my campaign world a civilization of drow (called Tiavai) that are not evil. Here's an overview of their civilization:
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Kingdom: Tiavai is the kingdom beneath the mountain. Ages ago a fanatical leader led a group of followers beneath the earth to "avoid the end of the world". They were not seen nor heard from for milennia, very few tales about them were even remembered. When the Tiavai surfaced again at the appointed time they found that the world had not been devastated as they thought it had and that their life underground, which had changed them forever, had been for naught. Tiavai is a vast network of natural caves and tunnels in the Fiarmonn mountain range. Homes have been shaped in the rock, giant caverns have walls with layer upon layer of cave entrances to individual dwellings. Underground monsters are common in Tiavai, and the Tiavai have become great hunters.
People: The Tiavai changed in order to camoflage themselves from the monsters that preyed on them, and to better hunt and kill the creatures. Their skin is coal-black and they have grey eyes and hair which ranges in hue from white through gray to blue-black. They can see in the dark, and also have the ability to sense heat patterns. Their eyes are extremely succeptible to bright light, and their skin burns easily in the sun. The Tiavai were so changed from their millennia of underground life that they are generally uncomfortable with life "above". While they do not harbor hatred for other groups of elves, they feel that they no longer belong in the world above, and continue the life that they have made below the Fiarmonn.
Government: The Tiavai were traditionally led by a spiritual leader called the Tiamar, generally chosen by his predicessor. While the Tiamar office still exists, most Tiavai no longer follow his command (since they feel their entire civilization was based on a lie). New governmental processes are being sought.
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