Skinning the playlist window was not possible at the time this question was asked. Now it is possible from version 2.16.
Quote from newspage ( http://bsplayer.com/en/bs.player/news/new/?article=17 ):
Help2Help (click) BSplayer: simply the best & most versatile (Build 1072 Dutch language here!)
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This feature will (probably) be implemented in BSP SkinMaker, but not in next release, probably it will take 2 of them before this will be possible with my utility.
The project is still alive, but unfortunally the time I can spend into it is every day less than the previous day
BSP SkinMaker (v1.07) the one and only Skin Editor for BSplayer
BSP Definitions Manager (v1.02)
BS.Player's FAQ (by BSPeter) | Italian language file (v2.57 build 1051)
|default, playlist, skinning|