One of my favorite boutiques is CUSP in Century City, CA at the Westfield Mall. They have the cutest, most hip, cutting edge fashion pieces I have ever seen in one place!! Granted, most things are quite expensive--you can still find some pieces that won't totally blow your budget.
Along with clothes, they carry shoes, handbags and a myriad of unexpected, one of a kind jewelry designs. I just saw this "twosome" ring by designer Erica Anenberg on their web site and I LOVE it...
http://www.cusp.com/shoponline/product.aspx?folderId=/shoponline/accessories/jewelry&page=1&itemId=Y0GR7
