We didn't do jerseys but as abit of a motivater and joke between the 10 of us that went we brought jersey related socks with abit of a twist on the traditional use for them
Yellow socks for guy taking the lead the most the previous day
Green socks for guy taking on the descents the fastest (and wow are there some amazing descents in France and Switzerland - couple of very close calls)
Polka Dot socks for best daily climber (gotto get to the top of those amazing descents)
White socks for best old timer/rider - there was only 3 of us under 35 so these bad boys where in high demand.
One of the best non Pinball related things I've done although I did manage to find a couple pins during our road trip, one pin oddly enough at the top of Alpe d'Huez