Okay so everyone's been wanting to know how to do it, so I decided to tell. What is it you ask though? It is the effect on black out that allows you to spell stuff out in different colors like this:

Ok so here what you do.
1. Go onto blackout in forge.
2. Look up above the air lift to where the smokes coming out, now hold stairs up above that building and infront of the smoke, then save and end to make it hover.
3. Go back in the game then put bridges across the stairs so you have more room to write, and spawn the effect juicy.
4. Start to write out what ever you want with weapons, but remember it has to be backwards.
5. Once you have it spelled out just the way you want save, then delete the bridges and stairs, so the weapons alone will be hovering. NO NOT DELETE THE BRIDGES AND STAIRS THEN SAVE, BECAUSE IF YOU DO YOUR WEAPONS WILL JUST FALL.
6. Go stand on the br tower and shoot and weapon across the map towards sniper tower area. for different color shot different colored weapons, for green a fuel rod gun or plasma pistol(which also makes purple?), plasma riffle for blue, laser for red you get the idea.
7. Now go into theater. Look through the weapons blast towards the weapons hovering in front of the smoke, if done right just the weapons show glow that color.
And just so people won't ask me where these places are i decided to post a pic with where they are.

Red=The smoke
Yellow=Where to put the stairs
Blue=Where to stand while shooting
Green=Which direction to shoot
Now hopefully with a bit of practice you can be making awesome screen shots like this:
...your welcome lol