When Castroneves, Briscoe, and Kurt Busch drove for Penske in this year's Rolex 24, Busch said it was funny listening to them saying the Daytona Prototype was heavy and that they should drive his stock car.
Really, with Dario Franchitti, Montoya, Dixon, Wheldon, Carpenter, Foyt, Meira, Allmendinger, Briscoe, Castroneves, Rice, Rahal, Wilson, Hunter-Reay, Vasser, Tracy, Danica, et al. all having driven in the Rolex 24 in recent years it's funny someone saying they have a hard time seeing OW drivers in the race. Mario was even talking about a multi-generational Andretti family entry at one time, although it didn't happen.
You can combine series and driver searches in the photo database if you edit the URLs by hand, although lots of them would just be of the car. Since Danica only got one race in before she was asked to not participate in the Rolex 24 any more there aren't too many photos of her in Grand-Am, but there are some of her actually in the car:
http://www.motorsport.com/photos/select.asp?S=GRANDAM&D=Danica_Patrick
You could replace the "Danica_Patrick" in that URL with any other driver's name, with the underscore between first and last names, to get everything in the database for another driver in Grand-Am if you want, although with Duno running several years in Grand-Am and Dixon driving several times for Ganassi you'll get pages and pages of pictures of the cars with only a few of the drivers.
Milka Duno on the top step of the podium for Grand-Am at Mont-Tremblant in '05 [it was a six-hour race and she had two co-drivers, Andy Wallace and Jan Lammers]: