hmmm well Renault could be challenged by BMW, if I think of the 2008-testings. At least in case of uglyness:
If there is a ranking with a 1,0 as basis, the Indy Car Dallara and 5,0 for a common F3 car as basis i would score that way (higher points = better looking):
7,0 - CCWS/IRL Champ Car 2007-08
6,4 - F1 McLaren 2009
6,3 - F1 Ferrari (F60) 2009
5,0 - common F3 Car
4,5 - F1 Toyota 2009
1,0 - Dallara IRL
0,8 - F1 Renault 2009