Water + Polarising Filters
Experimenting with a technique I picked up in a photo mag I placed a polarising filter on top of a light source (bedroom lamp) and a clear CD case on top of that. Then I added a few water drops before screwing another polarising filter onto my Tamron 90.
I like the effect and didn't have to do much at all in post with regards to the colours. I did have to clone out a lot of scratches from the CD case that were picked up though.