the longer explanation, and my similarly inspired card from last year can be found here. For a funnier 'Big Bang' explanation Sheldon explains it more fully than I can ;-)
To slightly elaborate on this years card... Newton ascertained by shining light through glass prisms that white light, far from being colourless, contains all the other colours (just think Pink Floyd's Dark Side Of The Moon album cover artwork...). Did you also know that, to experiment on how our eyes function and perceive colour Newton took a bodkin needle, shoved it 'betwixt the eye and the bone' and prodded his own eye ball! I decided that probably wouldn't have been the best thing to show on my card, memorable though it would be.
Physics (and anatomy) lesson over, my very best wishes of the season to everyone and to all a very sparkling new year!