If you bored with default window decoration of KDE 4 you can change it. On system settings you can also download window decoration theme. Here's the step.
1. open System settings.
2. open Workspace appearance.
3. open Window Decorations.
4. choose the window decorations for archlinux KDE4 that you like.
1. open System settings.
2. open Workspace appearance.
3. open Window Decorations.
4. choose the window decorations for archlinux KDE4 that you like.