I particularly enjoy modding/converting existing figures to create something unique. Had really been looking forward for Legion to arrive and I couldn't wait to start tinkering.
Here are a few of my current projects, maybe I can inspire you to try something similar?
I cut off Luke's left arm and sculpted him a new one. Replaced the hilt of the lightsaber, too, which was pretty fiddly and envolved some improvisation. Now I just need to get round to painting him...
I wanted to convert Vader into a more battle-ready pose, so I turned his head slightly and repositioned his arms (some additional sculpting was required). Pretty happy with how he turned out.
And here I modded an AT-RT from the core set. I've seen a similar conversion on this site, I believe, so thanks for the inspiration. Basically grafted the arm of the Rebel commander onto the AT-RT driver, added some green stuff sleeves and replaced his backpack (so he has a rifle). He's also positioned so it looks like he's standing up in the stirrups (or pedals, whatever).
I've got some other stuff that I can share if anyone's interested. Beside the general arm/head swaps that a few people have been doing, I'm also working on a few other things like Luke in his pilot uniform and a Twi'lek...
Thanks for looking!