I'd stick two fingers up to gender stereotypes! (In fact I did with my son both regarding nappies and outer clothes, he's the most colourful boy I know, no grey here!). Just think of the nappies as for you! You're the one putting them on and seeing them when you change him. Noone generally sees what's on your baby's bottom as they usually wear clothes over the top, and who decided pink, flowers etc were for girls anyway? In the 17th century pink was traditionally for boys. I'd just use the nappies that you like, regardless of whether or not they're boyish, you're not a boy! My baby never once complains, and still now at 2 and a half doesn't care a bit about wearing a pink nappy or pair of trousers. It might feel a bit awkward going against the grain of society at first but once you take the first step it really feels quite fantastic. The colour gender stereotype is just another string to the bow of sexism imo and the more people that disregard these silly ideas, the less the stereotypes will matter. (I've totally gone off on a tangent but you get the idea).