For those interested, I have a clear perspex cd holder, and this is the effect of the sun reflecting off the perspex holder, and the rainbow is refraction from the surface of the disk nearest the end. I've boosted the contrast and colour a little. The grainy looking background is mainly the pattern of the paint on the wall applied by a roller.
Haha. Fabulous colours to start of a new calendar month!
Thank you all for your kind thoughts and comments! I've added detail in the description of what the subject was, and what I did with it.
Thank you all for your kind thoughts and comments, glad you like it!