HELP!!! I Need Hair Ideas

I decided that I am going to add some extensions to my hair for the wedding.
My hair is shoulder length to begin with. I only want to add a few 'tracks' to the back for length not so much for volume ( I have too much hair already).

I saw Kelly Rowland on TV a few minutes ago and loooove the way her 'extensions' look.

Can anyone help me find pictures of 'natural' looking extensions??? [I want them to like as natural as possible]

I tried looking for celebrities to get inspiration from but only liked Kelly thus far.

HELP!!!