Now I know there are much better more elaborate custom skins people have made. What I've got here is a very simple one which edits the shortcutwindow to make the shortcuts smaller.
To use it all you need to do is download the zip file I've linked to below.
Then find the location you installed PlaneShift to, for me it is
C:\Program Files (x86)\PlaneShift
then once you find that open the art and then skins folder
C:\Program Files (x86)\PlaneShift\art\skins
And in there place the zip folder along with all the other skins. Then you launch pslaunch and pick the skin name in the options.
File location