What "theme"?
Oh well, I'll just come up with ideas
Chaos Weapons
Radiation Weapons
Absorption Weapons
Spazer Weapons (you know, like in Metroid?)
Heat Weapons
Singularity Weapons
Multi-Focused Energy Weapons
Draining Weapons
Crystallization Weapons
Acidic Weapons
Decoherence Weapons
Electrical Weapons
Nether Weapons (more suitable for a magic mod

)
Strong-Force Weapons
Weak-Force Weapons
Photon Weapons
Quark Weapons
Quasar Weapons (yes, I DO know what a quasar is

)
Holographic Weapons
Molecular Disruption Weapons
Phazon Weapons (Metroid again...)
Planetary Bombardment Weapons
Ionic Weapons
Tachyon Weapons
Meson Weapons
Gluon Weapons
Micro-Singularity Weapons
Nanite Weapons
Viral Weapons
Shard Weapons
Proton Weapons
Neutron Weapons
Neutrino Weapons
Chemical Weapons
Biological Weapons
Weapons of Mass Destruction
OK, I think I'd better stop now
