A dragon saddle would be cool, but only if you were dismounted as soon as you entered combat.
Or how about a 10% discount? For all the 14yea vets have paid, they deserve it.
Otherwise, useless stuff that gives no real advantageis best. I mean, if you've been around 14 years, you probably have every conceivable advantage. Still, it's nice to be identilfied, so...
Special title, yes. Shoes that make you glow, definitely. A simple sigil you could design yourself for use on closkls, robes or banners. Silver steed, yes. maybe some extrabface options,like a floor-length beard or hair(cuz 14year vets are such old timers), or an ethy cloak instead of the metal hued ones.
House add-ons are a cool way to show off how old or successful you are. Pond, yes. Glass windows that open or close. A special deednthat let's you build one floor higher than normal. A compost pile that gives random little prizes for your trash. A two story fireplace. A bell tower.
K, I'm tapped.