[@boomlover] Hmm, I would say it's as simple as how Blake uses dust with her clones. Each element would cause a different effect for your weapon. Say for example your character wants to turn Black Sun into a sword and use it to fight. He could take a dust crystal shard and have his weapon absorb it before it changes. If he were to use blue dust, he could have then a sword that was made of ice. Or even he could create whatever construct he imagines and it would be made out of ice, things like that. 

Edit: I'm actually thinking of editing my character a bit and having her clothing have dust weaved into it. Most likely green (which is wind I believe.) That's an option.