During my many years in Second Life I built countless sims. Sadly I never had the presence of mind to take pictures. The following sims I have built are all recent. All my sim builds are made up of different prims, from regular/classic prims to sculpted prims and finally to mesh. This has been done to keep lag at a minimum and it has always worked. My sims have all had virtually no lag. I am aware that mesh items and builds are prettier looking but they can also cause HUGE amounts of lag, especially when not optimised. Sims I have built in the past: 

• For GOR: two versions of Port Kar, City of Turmus, City of Tyros, Forest Port, Bergvik, Hunjer, Asger, two versions of Axe Fjord, Empire of Ar.

• For FANTASY: Arborea and Helios

• For MODERN: Garran village (a made up village in Scotland)

I am not very good at taking pictures, forgive the quality and the goofiness :)