I am not sure how seriously I'll be putting any effort in to the Guardian journey, but after finally getting an ancient weapon for my MS build I feel like the T13 rift in 4 minutes might be doable soon.
I've also been having fun mixing and matching sets of stuff for other classes. So far I've tried a weird strafe build with a mix of ancients and the Legacy of Nightmare rings. That can be very fast, but kind of weird and annoying that my strafe seems to cancel sometimes for no reason.
I also used a mix of Sages pieces and Tal Rasha for my wizard, and doing the crazy explosive blast thing zipping around crapping supernovas everywhere after killing an elite.
Mix of Innas and Raiment sets for punchy monk after getting real tired of babysitting sweeping wind stacks with no generator.
And I think I may goof with a mix of crusader stuff next. I'm having tons of fun messing around with class builds that are almost all new to me since I hadn't played in so long and things had changed with various patches plus the cube being added.