30 day wash-out hair dye...what color?

[Sashaa.]

I'm 14, & have bright blue/grey eyes, olive skin color, & naturally medium/dark brown hair with a few natural blonde highlights from the sun.

I just want to experiment with my hair, but nothing permanent that needs to grow out, just a 30 days wash out kinda thing.

I was thinking of a darker brown, like "darker chocolate" or maybe a dark brown with a little hint of red such as "raseberry truffle"

http://www.garnierusa.com/_en/_us/nutrisse_color_story/index.aspx#/storyPage

colors are on that site^^

thanks for your time!