Maybe you've seen these already, but if not...
http://www.etsy.com/listing/68629492/alien-invaders-ii-hand-dyed-aqua-burp
http://www.etsy.com/listing/65942266/game-geek-hand-dyed-hot-pink-burp-cloth
http://www.etsy.com/listing/66735221/alien-invaders-hand-dyed-turquoise-burp
Not diapers but perhaps more visible.
And pretty much this whole shop:
http://www.etsy.com/shop/RockerByeBaby