I left my memory cards under my tv?

I had three memory cards full of pictures i took on a trip to spain, i went to a Walgreen's to get the pictures printed but they all came up really bright and yellowish looking like they were really over exposed. My pictures were all still there but they didn't look how i took them . I hadn't touched them since i got home but i had left them on a coffee table underneath my tv. Could the electric current from the tv/wires have an effect on memory cards or is it possible that it was just the machines at walgreens? Is there anyway to recover them?