You could try these: http://solutions.3m.com/wps/portal/3M/en...e_hangers/

I haven't used these myself but i do know that 3M developed a system for picture hanging that the Tate uses to preserve some of the precious walls at Tate Britain from being drilled! These products are the domestic versions.... i think it will depend on what wall surfaces you have and how heavy the pictures are, but might be worth a try.