I've added a RatingBar in a layout :
The default RatingBar widget is sorta' lame.
The source makes reference to style "
?android:attr/ratingBarStyleIndicator" in addition to the "
?android:attr/ratingBarStyleSmall" that you're already familiar with.
ratingBarStyleIndicator is slightly smaller but it's still pretty ugly and the comments note that these styles "don't support interaction".
You're probably better-off rolling your own. There's a decent-looking guide at http://kozyr.zydako.net/2010/05/23/pretty-ratingbar/ showing how to do this. (I haven't done it myself yet, but will be attempting in a day or so.)
p.s. Sorry, was going to post a link to the source for you to poke around in but I'm a new user and can't post more than 1 URL. If you dig your way through the source tree, it's located at frameworks/base/core/java/android/widget/RatingBar.java