I think The Word is and Drive My Car are pretty early indications he was listening to Jamerson (one possible thing that might =groove for you). There's lots of groovy on the White Album, esp. Everybody's Got Something to Hide and Why Don't We Do It In The Road.
Solo stuff there's so many things to check out, especially in the Wings era. He was particularly adept at making super simple root-5 parts sound groovy, like Listen to What The Man Said or Mrs. Vanderbilt etc. It's not easy to make parts like those have so much forward momentum, but he had a great feel for it.
He's still writing some top notch songs now and again, but I can't think of any especially groovy bass stuff from the 90s on.
(Also: A nuttier Beatles nut may correct me, but I believe George stepped in on bass for She Came In Through The Bathroom Window.)