I got extremely far from my home in hopes that Lapis Lazuli got generated. Unfortunately I may never know if it did or not considering how rare it is. I was going to use it to make a Detector Block (from BTWM) but I can't even remember what I was going to use it for, lol
Wait, amazing idea: Since Detector Blocks can apparently detect weather, I can connect it to Block Dispensers to dispense a shield over my windmill when it rains! It would stop the windmill from functioning, but I wouldn't have to replace the gearbox as long as the shield deploys before the rain causes the windmill to spin out of control.