I wondering is there any component style changer for Lazarus?
In delphi xe2 and above you can change your form style in runtime.
The general consensus in Lazarus is that it is frowned upon to change your applications to suit
your needs. They want you to always adhere to the OS theme. So what you want is probably not possible with LCL. I consider that mentality crazy, and why I started fpGUI years ago!
Your alternative would be to take your chances with the LCL-CustomDrawn widgetset, but that is still years away from being usable in the real-world.