If your PC group doesn't have a bard, have an NPC bard approach them and offer to spread the tales of their grand adventures. If they accept, he will then ask detailed questions about their adventures and backgrouds, writing everything down. If they start to describe a monster, have him pop up a
silent image or
predestidigitation foot-high image and ask "like this?". Then he can correct and refine the image based on their follow-up descriptions. The bard thanks them, and does create stories. They could be accurate or romantasized or satiristic versions of their stories, depending on the bard. But the bard also secretly sells his detailed information to interested parties. Such as the powers-that-be or future big bads.
Afterwards, they get pestered by several people offering to join their adventuring party, or people who need their help in solving their problems. In addition, their wealth gets targeted. Not only do merchants charge them more, but they keep getting sob stories from people, guilt trips from family to share the wealth (or just hand it completely over to the patriarch), buisness opportunities, or various con jobs, but pickpockets go after their worn magic items and PCs find that their living quarters have been broken into and robbed. In addition, officials are finding new ways to tax these guys or conscripting them into some official duty or another.
You can throw in some good stuff also. Certain upperclass societies offers them memberships to their clubs, they may be able to buy a higher class level of citizenship that grants them better legal protections and city services. They may be able to genuinly help people who are suffering. They may be offered good employment opportunities training others in their craft for example. Wherever they go, people offer them free drinks and would like to hear their stories again.
There an encounter chart in the DMG 3.5 that details
urban adventuring. Just walking around the city can generate encounters, and there's a chart in the DMG you can use for wandering encounters when the PCs just hang out in town.