Seeing that I'm just a regular player and not a server owner or a dev of any kind, yes...? o.O If it's such a crime to ask, then sorry and let's just all forget that this topic ever existed. Sorry for not having the time to learn coding because of life and work.
Sorry, but my response was meant rude in any way, nor did I ever mention you needing to learn coding?
Anyways, since it's just the sprites you're looking for (which was what I was trying to clarify), as Triper said you can typically find them in the kRO grfs, or I'm pretty sure there's a million sprite threads on eAthena if you don't want to look there. Not that anyone would want to look on eAthena, because you can search erwirhugd and get 52 pages worth of a search.
Of course making your sprites look like third sprites would require server edits that are probably against the ToS on your server.