Ignore your DH. My wife occasionally thinks I'm a nut for wanting to pretty up the stash too. Mostly because there are a million other things that I could be doing that would be more helpful to the house (our floors really need a good scrubbing for example...
If I get a whole lot of joy out of prettying up the diapers and enjoy using them more, then that's good for my soul. 'nough said! (and here I'll add the caveat that usually my wife is very gung ho about my diapering projects so I get support more often than not)
I love your prefolds. I think the ducky one is my favourite but I also really like the idea of turning scooby into paw prints. They look so cute on your kids!