Ariel's Grotto

I have had a postcard sized image (roughly 5.50 x 4.25 )of Minnehaha Falls in my office on the west wall, you know for a Water image reference? I was wondering if anyone had cool smaller sized images of Fire, Air and Earth that might be appropiate?  Please send ideas my way!

Thanks!

This is my Water Pic.  #4676  http://zumach.zenfolio.com/p391786082   I like his work, but am looking for different styles of images...