This idea may sound a bit weird, but is actually very practical.
Step 1: Add new weapons to Fighting Claws, Unarmed, Might and Bestial
Yes, you read that right. Adding weapons to supposedly weaponless power sets.
Step 2: Create Aura Weapons for these sets
The twist, however: These are no actual weapon models, but auras that surround the character's hands when he attacks! Imagin an invisible Fighting Claws weapon with a hand aura like the Scourge/Cursed Bracers.
Here are the auras that came to my mind, but I'm sure there are far more possible:
Fire - Like the Cursed Bracers.
Ice - Light blue mist, like when using Ice Slide.
Wind - White "wind balls", like the when using Hurricane.
Lightning - Like Storm Rider, in default blue.
Blood Magic - Just like the Coils of Takofanes.
Darkness - Like the Coils of Takofanes, but in black-purple, like default-colored Darkness powers.
Arcane - Just like Aura of Ebon Destruction.
Toxin - The "tendril" (yes, CoX reference) aura of Aspect of the Infernal.
Nano - Same aura as Regeneration.
Sound - Like charge/projectile FX of Sonic Boom Generator.
Cosmic - Kirby Crackles, just like Power Flight.
Light - Same as the emmission FX of Particle beam attacks.
None -
The most important of them all! This "skin" allows the players to use their Unarmed, Might and Bestial attacks as they are currently; without an aura. Also; Fighting Claws attacks without actual claw weapons, for the chars that have blades on their bracers or gloves already.
Ofcourse, since we appearantly can't make auras in the costume creator colorable, there would need to be variations in each rainbow color, allowing for pink "ego fire" or green lightning like Gigaton's, for example.
Sold seperately (Q-Store) or in bundles (Z-Store).
And yes, this would only make for purely cosmetic effects. The attacks would still deal Crushing respectively Slashing damage. How to change the damage type of a power set is a
different subject.