Welp, since most don't care for ranks which go along with your post count, then perhaps different "groups" one could join which would give names a different color. Group names would be something all the members should have a say in. Maybe each group could even have a special Icon?(this would be something I wouldn't mind helping out with if it was acceptable.)
If an effects shop were to be added, it would need to be "free", unlike some which use a point system to gain such color effects and such.
If SJ wouldn't mind though, perhaps he could give us just a small list of features that are doable?