So I have semi-successfully dyed my hair blue! I'm going to describe how for my own reference as much as anything, since I didn't quite follow any one technique. Also I was started on this journey by a post years ago by
rachelmanija where she posted her cool oil slick hair, so maybe this will inspire someone else :)
So here is my hair bleached, and then dyed. You can see the half-bleached purple streak in the top right photo.

I did a combination of oil slick (dark blues, greens, and purples, blending to the natural hair colour at the roots) and galaxy (blue and purple jewel tones) Other similar styles are peacock and mermaid.
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