New Ideas Means New Colour Tests

I've decided to try out using two or three colours in one piece. For a few hours today I have been making some colour tests and writing everything that I have done down so I don't get confused or find a colour that I really like, but didn't write down the percentages of colours. So line blending two colours rather than one colour with white to get a single gradient. I would like to try a light blue and light grey together. Also maybe sunset colours. But I do need to be careful not to over do it on the colour as it could ruin the piece.