I’m using Themeco X Theme, which is a very high quality theme that is compatible with just about everything.
bbpress is too generic for me, it looks like its from 1992
I wish it was a lot nicer, I know there is good support for bbpress with an active dev team.
But there needs to be some basic standard for overall looks right out of the box.
I found another forum plugin that looks perfect right out of the box and is super simple to use: Asgaros Forum plugin
Seems to have a fairly active dev team that has been around for years.
Looks awesome right out of the box and super happy with it.
If bbpress updates and modernizes their look, I would consider switching back.