Mesmers doe it with phantasms.
Elementalists do it with lavafont.
Rangers do it with pets.
Warriors do it with berserker gear.
Thieves do it in stealth.
Engineers do it with bombs.
Necromancers do it with minions.
Guardians do it with shields.
Now I just need Arenanet to make a deal with J!NX and make these into t-shirts with the class symbols. Along with a line of white clothing splashed with the 2 logo.