You've inspired me to start doing mine now! Interesting - the ones you've missed out - are they not coloured? I have a few with no strong overriding colour, although if they were coloured they'd be more likely to be some colours than others, if that makes any sense. I see that you also have several colours, or similar shades, that turn up repeatedly. Same here, the main ones being a faun, beige or tan, and mauvish pink. Yellow is also very popular.