I think I'll stick with my two White DS3's (still Japan only...SCEA will never learn) and default black DS3...doubt red or blue will look better. But may pick one up.
EDIT: Just looked at the pic of the red/blue ones, they are way too "bright" in color and look quite corny. I'm sure children and girls will like these toy colors though.
Always was a fan of black/white controllers myself. Well, I was partial to the solid blue N64 controller (not the clear blue launched years later with the other cheesy looking "clear" N64/controllers). Although the default gray was best to me and most iconic. :lol