Windows titlebar icons - changing size/scale?

[Aravisian]

Crosslink:

How to scale menu, titlebar and window buttons?

I didn't say that I prefer Unity! If there is no implementet feature in the GUI to adjust this, then maybe this topic should be moved to the customization category? I also found this topic There they adjust the theme files. The intention is not the same like mine, in that topic they want to make it bigger. But is that the direction I should take? Thanks for the help!