This is interesting, the same subject just came up on the Valkyrie forum I follow. My waves depend on my mood. Anything from standard low wave, to a raised fist. My favorites are the UH Cougars hand sign, or the surfs up pinky and thumb. I am a two wheeler, my wife is the Spyder rider. She and her local friends developed an enthusiastic Forrest Gump wave that they use with each other.