Possibilities are endless with the option armor, the 30MM are starting to get very popular with all the kits and armor that are available now.
Looks ike you have a good stash of kits and options to keep the mind and ideas turning over.
The Elite Officer set, has some interesting parts that head piece reminds me of RX-0 unicorn mode. Shoulder armor is chunky but has some cool detail with the intake vents ?? And that claw, how can you not think of Freddy Krueger
The Defense Operations, again interesting parts especially the face sheild head piece. Again shoulders well detailed. Those claws are classic.
What would you call the part that goes on the back pack, an aerial of sorts ??