Just did this last Friday.
I did quick Blue bleach to lift my roots and blend some banding with a 20 vol to match my level 9.
I then mixed up one T18 Wella toner (Lightest Ash Blonde). To the toner I added 4 caps full of the Wella 050 Cooling Violet as well as half a bottle of the protein filler for platinum hair (it's purple).
After the toner was rinsed out (my hair was pretty grey)-- I used Manic Panic Cotton Candy, Electric Tiger Lily, a dab of Rockabilly Red, and pastelizer to make a pinky peach. That was throw in my hair for about an hr.
It left me with the below. It is a little uneven, but since I applied the toner in strands, it almost looks like silver highlights. =) I actually REALLY like the way it came out! =)