Ross was dressed up as a spud for the Halloween party in season 8. He wore a potato costume and was accompanied by his pet monkey, Marcel, who was dressed as a carrot.
Ross was dressed as a satellite potato he called Spud-nik, which is in reference to a real satellite. Unfortunately Ross costume was also described as looking like "faeces".
In the show Friends, Ross was dressed up as Spud-nik for the Halloween party in the episode "The One with the Halloween Party". He was dressed up as a potato with a satellite dish on top.
In season 8 of Friends, Ross dressed up as "Spud-nik" for the Halloween party. His costume was in the form of a satellite with two potato halves representing the orbits around him.