Trivia: Just a nice little factoid to use down the pub. Marcel was removed after this season because the monkey that played him kept throwing monkey poop at the actors.
Trivia: In the first season there was no street behind the coffee shop,(for budget reasons), instead they used a painted background and a lot of flowers in the window frames of Central Perk to hide this.
Trivia: In one of the intros used in season 1 on TV you can see a clip of Ross, Chandler and Joey dancing in Ross' apartment. That clip is not in any aired episode. It's in the extended version of "The One with All the Poker".
Answer: The painting doesn't have a name, and if it does it is never mentioned in this episode.