The 1999 Jordan has been mentioned, as has the 2000 Arrows (which certainly was nicer than the 2002 car - I have an embroidered picture of The Boss driving the 2000 car in my room. My mum spent ages on it. She was disappointed to finish it, only to be told the team went bust a year ago...).
I'm picking cars from '98 on (when I started watching F1) and I'm thinking of...
The Stewart Ford SF3 (1999).
http://www.soloformula1.net/images/1...99_Stewart.jpg
The 1999 Williams (even though it wasn't in keeping with traditional Williams colours).
http://www.soloformula1.net/images/1...9_Williams.jpg
And this surprise contender, though more for the curves! (2004)!
http://nigel.wyatt.users.btopenworld...lliams2004.bmp