How do I remove a painted Wall Mural?

My church's youth group painted a wall mural in their youth room, and then several clouds each year with their signatures. We're thinking of redecorating the room - and we'd like to keep the signatures and mural. Is this possible? It's just painted on white paint on cinder block.

Answers:
Take pics of the signatures and clouds and have them transferred onto tiles and then install-- This is also a great fundraiser way of making dollars .Have each member sign their name or add photo and transfer them onto tiles- which of course they will purchase. Please visit... i need some ideas?
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