One of the things I like about crochet is the choice of colours. With this blanket I used 17 colours. So for each little flower using 3 choices of colour, the number of permutations is (if I remember my maths correctly) : 17*16*15 = 4080 choices. The problem is that some of these are not pretty, so for example, dark purple, dark blue, mid blue is very dark, and then all 3 palest pinks is too pale. The challenge comes in choosing "nice" choices. Sometimes, I like to make them a bit edgy and clashing, like the blue-orange-blue in the bottom middle of the blue picture. Other times I try for "nice" with for example the blue-pale lilac - lilac in the bottom right of the blue picture.
Another interesting thing is that some people don't like some combinations that I like. I think that adds to the interest of making the choices.