I could give you a better answer if you specifiy what kind of photos you are using and/or a theme for your project.
*edit*
Eva Cassidy’s version of “Autumn Leaves” would be perfect.

You could use lyrics from “Castles in the sky” and take a picture of a clould or something that looks somewhat like a cloud. Or you could edit it to make it look like a cloud.
Hows that sound?

It’s an instrumental, but if it’s trees, you could use ‘The Memory of Trees’ by Enya

Well lets see , it all depends on the mood you wish to set.

Up beat 80′s – Freeze Frame by J Giels Band
Rocking – Still Frame by Trapt
Easy Rock – Take a Picture by Filter
80′s Metal – Photograph by Def Leopard
Slow – pictures of you by The Cure

End of the innocence by don henley would be good. Also you might want to try while you were sleeping by casting crowns, or every breath you take by the police.

You’re Beautiful by James Blunt

I’ve Gisele’s pic on my wall with this song watermarked.