I did a complete rewrite from scratch for lxappearance.
The source code is here.
Features of the original lxappearance has all been implemented except
icon theme installation.
Compared with the old one, the UI is improved a little and the code is
much more cleaner.
In addition, this version contains support for changing cursors.
Later, more options will come and support to changing color scheme
will be added.
Please test it.