I don't mind a certain amount of pink - especially with brown or grey as you suggest, and have had to give into it with having a daughter (against my express desires when pregnant!) but my son will have enough pink to wear with his sisters hand-me-downs without me ordering a pink nappy for him!
I'm tempted to go for pale blue cuddlesoft, I think it will stand out more than on palest green. My first choice would be butter minkee, but I think they've run out.
Do they still have the pale blue and white mix minkee ? That lovely! Just had a look and they don't have it. Sorry. What about white or cream dotty with a trim on the front in this http://weenotions.co.uk//gallery/main.php?g2_itemId=729