Flaked oats - (Adds body, smoothness, and creamy head)
Flaked Barley - (Helps head retention, creamy smoothness)
Carapils, Carafoam - (Mouthfeel, Head retention)
Crystal or Caramel malt - (Sweet caramel flavor,mouthfeel,amber color,Helps head retention)
Candi Sugar or rock candi - (smooth taste, good head retention, sweet aroma and high gravity without being apparent)
I only added what I could think of as far as Mouthfeel, Body goes...Others will probably chime in as well. At least this gives you an idea. It all depends on what beer your making and what characteristics you want it to have...Your not going to put certain malts in beer if your brewing to style. Play with it.