I found an artist on PixIV who seems to specialize in this:
(I don't hotlink or rehost other people's pictures, so you will need to have a pixiv account to see this)
Capone (surprisingly he's a looker!)
http://www.pixiv.net/member_illust.php?mode=manga&illust_id=21205432Drake (And other supernovas)
http://www.pixiv.net/member_illust.php?mode=manga&illust_id=21196881Hancock and sisters (and Luffy)
http://www.pixiv.net/member_illust.php?mode=manga&illust_id=17410696Hawkins (OMG baby voodoo dolls)
http://www.pixiv.net/member_illust.php?mode=manga&illust_id=15692692Kid and Killer (Killer is particularly hilarious)
http://www.pixiv.net/member_illust.php?mode=manga&illust_id=15295125Law (with babysitter Bepo)
http://www.pixiv.net/member_illust.php?mode=manga&illust_id=15480011These are awesome, makes me wish I could read Japanese.
ohgod… that Killer..
pffffft X'D
loved all of those X'D
just had a thought since CP9 and the Shichibukai have been drawn as kids by Oda...
why has no one asked him to do the Supernova as kids? X'3