There are no official alternative skins for our software. You should not use any version of FL Studio that installs pre-skinned as this will be an illegal copy of the application.
We are developing Themes for FL Studio 21. You can follow development here in the User Forums.
FL Studio 12 and 20 use a vectoral GUI (Graphical User Interface). It is not possible to modify the GUI without unauthorized changes to the FL Studio runtime code.
FL Studio 11 and older versions use bitmap images for the GUI. Where skins modify any part of the existing GUI bitmaps, this is an unauthorised use of our artwork.
Modification of the FL Studio GUI, outside the parameters provided in the program options, is a violation of Image-Line's copyright and moral rights. We expressly forbid anyone to alter, transform or build upon FL Studio logos or GUI artwork.
Image-Line Support Team