Space Invaders?

and I am not referring to the ever encroaching 'stuff' in my work space (I know I cleared it recently, but it doesn't take long to get junked up again, that's what happens in a creative space) but these little beauties:

I was laying them out to see where I had gaps in my prospective rainbow, and I think I need some more purple and blue. They look like a very colourful game of space invaders (anyone under the age of 30 will probably not understand that reference unless they are seriously into retro video games). These are what has been keeping me sane while visiting over Christmas - great to have some hand sewing on the go when away from my sewing machine.