I picked four colors, two blues: Poseidon and Aquamarine. And two purple shades: Purple Rain and Violet Dream. They were 11.99€ for a 118ml bottle (you can also get 236ml for 18.99€). The first thing you will noitice is that these dyes smell incredibly good, like grape candy!
I first dyed my four color set with firth my own black color at the roots, then faded into Poseidon, Purple Rain, Violet Dream and Aquamarine at the tips. The Poseidon color was the only color I was dissapointed by: it is a lot different then what I hoped it would be, and it doesn't give a good transition between the black and purple.
My favorite colors are Purple Rain and Aquamarine, I really like Violet Dream as well, but it is more pink than purple, and unfortunately Poseidon didn't reach my expectations... You can get the dyes either at arcticfoxhaircolor, on Amazon or at Attitude Holland. They are the same price as Manic Panic, but more expensive than Crazy Color.