If none of the actual themed Nintendo 3DS and 3DS XL units have been doing it for you, maybe you just need the right case for your portable. Capcom is getting ready to introduce a Blue Bomber themed case in celebration of the original NES series coming to Virtual Console, and the 25th anniversary item will be available in the Capcom Store.
It's not on sale yet, but according to Capcom-Unity the case will definitely be at San Diego Comic-Con. the Mega Man case comes in both regular 3DS and 3DS XL flavors.
Capcom also has more Monster Hunter 3 Ultimate cases on the way for anyone who missed out on those.