What are the best AFK activities to do while working from home? (Or in the office when nobody is looking)

I work a f*cking awful office job and I just came back to good ol' RS to cheer myself up a bit.

My account is an Ironman, most skill levels around 60-70 (with a few exceptions like herb/mining which are still pretty low).

As the title suggests, just looking for some ideas so I can enjoy wasting my life instead of doing my job :) Thanks.