Okay, well this is a magic item I introduced in my current campaign that's really mostly for flavor, but it became an interesting and central item to the party. It's more story than statistics, but I hope you find it interesting.
Back when they were third or fourth level, the party defeated a small band of ogre raiders. They cast detect magic on the stash, "just in case" and were surprised to come up with one item ... a pewter mug. The mug had three markings on it; a rune for the sea, a rune indicating a bird above that, and a rune for the guiding star above that. An identify spell told them that a simple toast to the Goddess of Vice would fill the mug with ale. And it was the finest ale they'd ever tasted!! And it worked over and over and over again. It seemed bottomless!
They used the mug frequently. For their own use and to help win over friends (which worked quite well). There was even talk of opening their own tavern with the mug acting as their sole source of ale ...
Ah, but nothing is ever that simple, is it?
Flash back almost 300 years ago. The Soaring Gull Tavern (on the opposite side of the kingdom from where the players are now) has been beset by pirates!! The owner's wife and son have been kidnapped and Ol'Shaky Bones himself is loading barrells of the finest ale in the lands onto his dread ship. In steps Roderigo, one of the swashbuckling heroes known as the Sea Swords! He single handedly rescues the woman and child, and with the aid of some of his commrades slew or drove off the offending pirates!
Caliphus, the owner of the famous tavern is eternally grateful, but Roderigo eschews any monetary reward. "Just save a glass or two of that fine ale for me." Well, Caliphus does one better and has a unique and special magic item created just for Roderigo ... it's a pewter mug with the symbol of the Sea Swords (the sea and guiding star) as well as the symbol of the Soaring Gull Tavern ... and anytime he toasts to the Goddess of Ale, a full draught is instantly teleported from one of the kegs in the basement straight into his cup!
Back to the present ... the Soaring Gull tavern has changed ownership many times over, and the tale of Caliphus and Roderigo is long lost. The mug itself has changed hands several times over and for generations nobody has even realized that it was anything more than an old and battered mug.
But now suddenly gallons of ale are disappearing from the Soaring Gull Tavern! The owners make light of it at first, telling tales of old brewmeisters come back as ghosts to sample the product to make sure it's as good as ever ... but after they begin finding cask after cask of empty ale it becomes a more and more of a problem! All kinds of guards and wards are set up but to no avail ... the thieves remain unchallenged!
Finally some divination magic reveals that the ale is being teleported far away ... and to a certain party of now (somewhat) famous adventurers!
Well after the winter thaw, the inevitable confrontation took place! The party handled it graciously, and offered a generous sum for the ale consumed. At first the new owners suggested the mug should be returned ... but when they began to see how famous and popular these advernturers were here in the affluent eastern side of the kingdom they came up with a different offer ...
Now the party has a tab at this tavern hundreds of miles from their home base ... but the rates are better than normal patrons. Why? Because every time they offer up a drink they make sure to tell everyone in earshot how much they love the Soaring Gull Tavern and how it's got the finest ale in all the land! And how they love to visit there every time they're out in the western part of the kingdom ...
Yup, they're the first adventurers (in my world, anyway) with an endorsement contract.
-- Mark C'sigs