One cool thing we did back in my AD&D days was have to deal with the fact that there weren't really any banks around. We'd acquire these incredible amounts of money, but had few safe ways of storing it somewhere and keeping it accessible since our PCs were constantly traveling.
So we often commissioned personal items for our PCs to basically wear our wealth. I had a cleric who commissioned a mithril holy symbol, inlaid with golden symbols of his faith. A warrior with custom designed, jewel encrusted scabbard, custom-stitched dragonhide leather boots and so on.
Essentially, the same kind of "art object" style treasure you might find on the dead body of a fallen adventurer deep in a dungeon somewhere, we commissioned for our PCs and spared no expense. By the time, we were high enough level to settle down, my PC was wearing well over 20,000 gp in expensive tailored clothes, armor, and weapons. It added a lot of atmosphere to the game too. When our PCs began to move in political circles, their exotic gear and clothing attracted lots of attention. I mean, when your 5000gp custom boots are tailored from the hide of a shadow dragon that you slew yourself, even kings stop and take notice.