Would love to post a picture of my G2 sniper rifle as an alternative answer to the first question,but the only camera I have access to is on my tablet, and I'm about ready to toss that thing in the garbage. Essentially though, it's pretty much just a nine-inch long Stud Shooter that utilises more than a few axel connectors, a piece of Vorox armor, and those two curved armor plates present in Onua Uniter's hammer for the chamber. The gear on the back that activates its function doubles as its stock.
As for the real reason I'm here, I'm considering repurchasing all of the Bionicle G2 villains at some point in the future to make some cross-wave combo models, and I was thinking about how some of them might turn out recently. Now obviously, I'd be doing my own thing with them completely from scratch, but I figured that seeing what some other members of the community came up with would help stir the creative juices around a bit and provide me with some much-needed inspiration.
For those of you who wish to accept this challenge, the following list of combos (arranged by color scheme) should help out a bit in terms of what I'm looking for:
Combo 1: Lord of Skull Spiders, Kulta the Skull Grinder, and Lava Beast
Combo 2: Skull Scorpio and Umarak the Destroyer
Combo 3: Skull Slicer and Umarak the Hunter
Combo 4: Skull Basher and Quake Beast
Combo 5: Skull Warrior and Storm Beast
Potential combos not on the list above are fine as well, so long as they at least consist of one 2015 and one 2016 villain set, respectively. Happy building!