Have you seen Florastar's PAX video that she recently posted on her youtube channel? It's short, but shows her, Direwolf, Slowpoke, Slowpoke's girlfriend, Morvelaira, Morvelaira's husband, Tahg, LexManos, KingLemming, and other FTBers at their pub get together.
Quarries full of lava are fun. Just don't get them to close to wooden buildings.
Also make sure they don't leak into nearby ravines/mineshafts. My quarry dug into a dungeon, but the corner of the dungeon ended up intersecting a mineshaft complex that also connected to a ravine...
And the northern corner of the ravine opened up in a swamp.
In my next world I may connect several quarries around my base and fill them with lava to make a super sized lava moat. Or use PfF's pumpkin/melon/carrot/potato juices to make a massive veggie juice lake.