I also think it depends. The examples in the post above I think are good for one end of the spectrum. On the other side, here's some examples of what I think are -not- good ideas:
1. Having conversations with your VNPC children. Why? a. circumventing the language code by nesting conversations in emotes is against the rules and b. circumventing the ability of other people to "listen" to both sides of the conversation by NOT using the language code is also against the rules.
2. Always being the "winner" of PC vs. VNPC "contests." Meaning:
>You stare at the tressy-tressed man, who withers and runs away.
>You squint at the green-eyed elf, who slinks off.
>You push your way through the crowd, bowling over the bald dwarf. The dwarf responds - not at all.
>You blow a kiss and the roguish rogue catches it in the air, beaming a smile at you!
If you're going to use VNPCs in your emotes, let yourself be the loser once in awhile.
>You stare at the tressy-tressed man, who stares back, and wiggles his brows lasciviously at you.
>You squint at the green eyed elf, who snickers before slinking off.
>You push your way through the crowd, bowling over the bald dwarf. The dwarf rolls back up and glares at you.
>You blow a kiss and the roguish rogue pointedly ignores you.