Nikki comes to you in:
Skin: Ladyfrontbum 'naughty' skin
Eyes: Oh my eyes @ modthesims
Sliders: Johna's body sliders & Delphy's breast sliders (you don't have to use both, I just prefer Delphy's breast slider.
This is all I can remember as far as custom content. But I do get most of my items from either Cstlyes (check side links) or Mysims3blog packagesims3package
He just makes my belly button smilez!