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I think thet are doen on the new maps where you can get the effects bubbles and just keep adding them. Use explosions and equipment to get the effect.
Or:
http://www.youtube.com/watch?v=aqSRcBzhamk
Just go on forge, make the writing with barrels/guns/crates, then view them through filters like, a bubbleshield and an overshield, or through an explosion etc