Minimalist, modern light fixtures. Pendants, recessed, track, outdoor. I like the Alaska Trimless - a ceiling mount globe light - small and interesting.
Fun, lovely designs, but limited Revit files - some can be found on Archiproducts (for Memory, a "balloon-like" ceiling light). Lots of great designs, though. Perhaps can import sketchup files?
Cool moon light, a light that looks like a cheese grater, paint can lights. Many of these lights are available to download in RFA files (found in one big download at the bottom of their site)
Geometric and fun, but understated lighting. The "Button" light, for instance, that looks like a giant hanging button. Pipeline series, Vine series (looks like grapes, sort of), Pebble series, Slab series (acoustic).