Editing an item
 

I remember playing on Guildwars 2, and one of the GMs had a lolly pop! Now how could i edit an item model/skin like this gm did?

You can't edit any models or skins very easily. And the server would have to have a download that every client would have to get in order to see the changed models. Since you didn't download anything to play there, that must be one of the models that comes with EQ. It has a ton of really weird ones already, you just have to experiment or find a list somewhere.

Find an item editor or EQAdmin program that fits that EQEMu version.