Whats a good blend with 613?

I think the red would be good. I really like erin's (xoxowhitefoxxox?) super dark lowlights with 613 right now too.

if you already have the hair in the colors you thinnk you want take them around stacked one on the other in the proportions you think you owuld use and tyr them out in the different lights you are likely to be in.  outdoors, flourescent at the office?, tv glow?, near you reading light etc.  considering the colors in various light sources always helps me.  My highlights look very different under the flourescents in my lab than they do outdoors. 

Hey ya'll lol i was wondering what you guys think is a good
blend to add to a 613? i was thinking about putting a darker
color underneath in the back of my haed and was wondering
what color would look really nice, i have a red color which is
like a natural strawberry blonde color that i colored myself, do
you think that would look nice? its like the same color as tyra
banks color ( the red one)