What kinds of frostings have a lighter texture?
Have you ever tried Italian Buttercream?  I learned about it in culinary school and it is now my favorite!  LIght, airy, not too sweet.  It has a wonderful texture!

Here is the recipe we used - It's a keeper!
http://www.grouprecipes.com/92114/italian-buttercream-from-the-culinary-institute-of-america.html

Italian buttercream is made by blending butter into Italian meringue.