I wrote a simple plug-in that allows you to change the Look&Feel in LateralGM.
File > Look&Feel Settings to change the L&F.
Source included in JAR and license is MIT.
There seems to be some stupid "can't fix" bugs because Swing is so stupid.
If you have Nimbus you probably don't want to use it because it screws up so often and it's so slow with the JDesktopPane (this is because the fool renders that thing in the background every time you move a frame).
It will probably work for old versions of LateralGM but who wants to use old versions?
Download V0.80