Would be curious to hear any interesting flavors / ingredients that have worked for you as I try to figure something out.
BaconFreak.com has a bunch of different flavors they sell, that should give you some ideas.
I have tried a couple, interesting.
Just personal opinion below:
I find the sweet flavors end up tasting like burned sugar when I fry it up. The sugar tends to burn in the pan, making it really hard to cook. Your sskills may be better than mine. These may be a good candidate for Baking bacon.
I would think Garlic/Jalepeno sounds good. Could be added to a wet or dry brine.
I also used Garlic & Cayenne on some dry cured back (canadian) bacon that was quite tasty.
The good thing about making it yourself is that you can make a bunch of little chunks at the same time and see what you like.
And if they don't work out for you, you can always add them to baked beans.
Keep us posted on your trials.