I've also seen single round lantern-style fittings "strung" between poles that hung in the centre of the street. Not too many of them around anymore. They looked cool though. Much more ornate than the modern ones.

Gas street lighting has re-appeared in some locations too. It provides a really soft light and it's much more ornate. It's used exclusively in Dublin's phoenix [Linked Image from images.dublin.tripod.com]

Normal Dublin Electric (usually sodium) street lamp.

[Linked Image from cityofficesupplies.ie] (Standard Dublin Street lamp)