I am running NetBeans on Solaris and to be honest I don't like the default look and feel, mainly because of the sick-looking blue color. But it's very easy to change the look and feel. My favorite look and feel is JGoodies Looks
. To use a custom look and feel simply run NetBeans with the following parameters (for Looks):
./netbeans --cp:p /export/home/roumen/looks-2.1.2.jar --laf com.jgoodies.looks.plastic.PlasticXPLookAndFeel
If you want to change the look and feel pernamently, you can add it into etc/netbeans.conf. There is a parameter called netbeans_default_options. Add to this parameter string "--laf [LAF]", where [LAF] is the class representing the look and feel. Note that GTK LaF has improved a lot in JDK 6, so I also recommend trying GTK LaF if you run Linux or Solaris.
Here are screenshots to compare the default Solaris look & feel and JGoodies Looks:
NetBeans with default LaF on Solaris
NetBeans with JGoodies Looks LaF on Solaris