I could make a 1d12 table of 1d12 tables I want to make. That’s how much fun they are. I won’t bore you with that one here, but it could be done.
I make 1d12 tables for a lot of odd random things as a DM, though. They add all kinds of spicy goodness to bland encounters. They work for weather, travel, global events, some NPC attitudes, and of course, random monster encounters. I know I’m old school, but I still believe in the old wandering monster table. Because maybe the troll down the hall decides to go for a stroll about the time the party thinks they’re going to rest. Bwah ha ha! Rolled an 11. Meet the troll.
I think the d12 is the most underrated dice in any game, except ICRPG. Yay! I suppose they’re good in SWADE and EGS, too if I remember right. But D&D and Pathfinder are very reserved in their use of the d12. My solution is to use them for any and every thing I can think of. I carry the things for fun every day. Really.
My players have called me out on it in the past. I have a pattern for most of my tables. You can probably guess the pattern. 1’s are, of course going to be catastrophically bad or unwanted news. 12’s are, naturally, something favorable or at least more favorable. 2-3 are usually something unwanted but not scary bad. 10-11 are usually the pretty good end of whatever the table is. Everything else is likely meaningful but random. I’ve done more random variants, but that’s the gist.

Let me throw down a sample:
Roll 1d12. Average Night at the Stable:
- The stable catches fire! If the group has mounts there, the animals are in danger! One of the stable hands running into the inn a major panic to get help and save the animals.
- Horse thieves! Choose a random party member who had a mount in the stables. Their mount is now missing.
- Oops. The stable boy accidentally left the stall door open when he was cleaning. Choose a random party member. Their mount is now out wandering around somewhere.
- Asleep on the job. Stable keeper accidentally loaned one of the characters’ mounts out to a local merchant. The animal is treated well, but won’t be in the stable until the next night.
- Where did they find this kid? The stable boy decided to ignore his chores. The animals are not fed or watered, and stalls are not cleaned out. This will lead to somewhat moody, fatigued, smelly mounts the next day.
- All is well. The stable keeper feeds the all of the animals a treat! Unfortunately, it doesn’t agree with one of the mount’s tummies the next day. (Choose a random mount.)
- All of the mounts are well fed, well treated, and are ready for action the next day.
- The stable keeper notices an issue with a horse shoe and takes care of it, free of charge. He lets the group know the next morning.
- The stable keeper chases off a predator outside the stable. He lets the group know about it in the morning. One of the characters’ mounts is still skittish. The stable keeper will offer to loan out his personal thoroughbred for free if desired.
- The mounts are well-loved. They receive a +1 discretionary bonus to any one given roll during the day.
- What’s in that feed? Whatever the stable keeper fed the mounts, is working very well. The group receives an Advantage on any ONE given roll related to travel or the mounts.
- Holy buckets! The mounts are well fed, loved and ready to go! ALL mounts gain a +1 discretionary bonus and Advantage on one travel/mount related roll. They will also automatically pass the first morale roll within 24 hours automatically! The mounts are happy.