I missed this thread somehow. After waiting an eternity for everything to load, it was interesting to scroll through and see all the artwork shared. I am unfamiliar with many of the artists. I'm not a fan of some of it, but that's why art is subjective.
I really enjoy the Montmarte period of Parisian art. I have a couple prints of the posters from this time on my walls. Henri de Toulouse-Lautrec is the most well-known artist from this time. The Chicago Museum an exhibit of work from this period one summer. It was one of my favorites because of the various sketches, posters, and painting.
I really like the behind the scenes painting of the cabaret/theater/brothel lifestyle.
Wiki-wiki is you want to read more:
http://en.wikipedia.org/wiki/Henri_de_Toulouse-Lautrec
A selection of his works.