If you are also headed to DCA, it looks like the new Lamplight Lounge that just opened has a nice Pixar theme and an interesting menu. And the new drinks menu also looks very inventive.
Blue Bayou has the best theme for a table service restaurant, but I also like the (quick service, but on real plates) Rancho Del Zocalo area, which somehow feels like it could be in some Wild West town!
And while it isn't table service, Flo's V8 Cafe in DCA has a fantastic theme and great views from every seat. Either you are watching Cars Characters come and go on the busy streets or watching cars race around the track on Radiator Springs Racers, so fun!
Have fun planning!