I've recently being experimenting with Multiple Exposure in camera and also mixing it with ICM. I love the creativity and freedom it gives as well as the unexpected  results. It doesn't matter how skilled you are at it it will always give you the odd surprise.  Quite often the image has a watery soft feel to it but depending on the settings used you can get a variety of results. My images are all done using a Canon 5D MkIII.

Coast 1
Tinside 3
Spring 3