You have got to be kidding me:
http://www.todayonline.com/articles/100346.asp
World road race champion Tom Boonen of Belgium will wear a gold and diamond-studded helmet on the roads of Europe this season, according to the Belga news agency.
Boonen, who rides for Quick Step, will wear the Laser-made helmet for the first time on Sunday at the opening stage of the tour of Andalucia in Spain.
The helmet, which is worth an estimated 7,000 euros, is coloured in the same rainbow style as the world champion jersey Boonen will wear this season but it is also decorated with gold and a single two-carat diamond.
http://www.todayonline.com/articles/100346.asp