Colour Schemes

Tutor has told me that i need tpo reel in my colour sceme from just a random selection of everything (random(255);) to something a bit more restrained and consistent. Something which I resent because I prefer having a range of colours which create even more colours when they ovelap... Buuuut I guess I could create a range in a select colour scheme with the same amount of change...

Here are some samples of what colour schemes I'm thinking of...
N.B. I'm using the first style of code so that more balls will be visible

 I'm leaning more towards the green side just because that's my favourite colour