Suggestion: Now that Jamie has taken over the trail plugin, I think it would be pretty awesome if there could be a special trail feature where you could set it to a custom text that repeats a certain word(s). e.g. if I wanted it to say Berber everytime I walk with light blue text, then I could do "/trail custom &bBerber". Obviously there would need to be rules and such limiting people to what words should be used because of profanity. Link To plugin: N/A
Not sure whether that is possible. The current trails summon particles,i assume this would need to be a plugin which spawns entities near the player. Hidden ones which have a force-visible name label. I assume this would require much coding and maybe lag because of entities, but it sounds good. (Jamie may feel free to shred my contra argument to pieces if there is an easier way than ummoning invisible entities with a short lifetime which are then respawned at a different position to create a particle-like effect [Or just one single label/entity which persists, like a second player name tag.])
314 is correct, this is nearly impossible unless you could somehow decipher the etable particles to be possibly changed to english. I hate to say it, but this isn't possible with the way the trail plugin works.
Technically.. you could use holographic displays to do that. But that just sounds like an awful thing to code.