The Body Shop carries a nice selection of nudish lipliners (about $9 or $10)
Look for Clover Pink, Pink Chocolat, or Beech...I've been using these for years as lip color with gloss or chapstick on top. They are very pigmented, stay on, and don't dry your lips out. Clover Pink is the best- it's a natural lip color, just a wee bit deeper.