What color highlights should i get?

My hair is brown like a href="http://www.google.com/imgres?imgurl=http://www.gossipygirlz.com/wp-content/uploads/2009/04/ashley-tisdale-hairstyles-brown-hair-pics-2.jpg&imgrefurl=http://www.gossipygirlz.com/ashley-tisdale-hairstyles-brown-hair-pics/&usg=__KxAMqmo7mUUdXtRx4ncf_BFIYUU=&h=594&w=386&sz=65&hl=en&start=0&sig2=n_DSF9nmPHpgA8x4GiPVlg&zoom=1&tbnid=CC99a96ErjIE8M:&tbnh=115&tbnw=83&ei=_mTITbDZGI3egQfqz5TOBA&prev=/search%3Fq%3Dbrown%2Bhair%26um%3D1%26hl%3Den%26rlz%3D1T4ADSA_enUS359US360%26biw%3D1345%26bih%3D529%26tbm%3Disch&um=1&itbs=1&iact=hc&vpx=306&vpy=74&dur=3401&hovh=279&hovw=181&tx=118&ty=122&page=1&ndsp=34&ved=1t:429,r:2,s:0" rel="nofollow"http://www.google.com/imgres?imgurl=http…/a