Don't intentionally not bring it up to your ex. Be adult enough to talk to her about it and ask her personal opinion on what to do with them. In my situation, pics are still on his computer, and i've got pics on my computer. It depends entirely on how much you still trust her. Don't ever post up something or show anyone else without their consent, it's a huge violation of trust and you should be gut shot if you mess that up
Seriously though, there's going to come a day when you're going to want to see them again, keep it password protected (From guests to your computer) or burn to cd.