one key point is: changing various gamelogic workings for the sake of creating something new.
I'm not so sure about originality.
Blaster Knockback - Idea from Xonotic
Promode Physics - Promode (Duh!)
Modified Turret Aiming - "Realism" idea that obviously failed
Tyrant Charge Modifications, ramp jumps, smooth healing blah blah blah - GPP/KoRx/Tremfusion
Dynamic Lcannon primary Speed - Surprisingly enough, I did this before unv did theirs. Probably the only thing 'original' but isn't now that unv has theirs dynamic.
Dynamic Regen (humans only) - Xonotic
Anti-Spam Blaster - Idea 'Partially' from WarSow's gauntlet gun thing
Flamer changes - Quake 3's Plasma Gun (Wall Climbing/The old tremulous mod for tricks, anyone got its source, qvm, or even name?) + Fixing "Why do you hurt yourself when you touch a wall, aiming away from the wall?" bug
Larmour removing recoil partially - Realism, he's got gloves, why not add a COD-style effect?
Bots crouching/jumping when dodging in combat - Hell, this isn't really much of an idea, really.
I'm not sure if I can remember anything that's "truely" unique from my mod.