You can disable shadow/glow in "oxygen-settings" as well as chaning colors.
You can also use one of the plenty aurorae/dekorator/smaragd themes or qtcurve/skulpture/bespin to gain a specific look.

sir_herrbatka wrote:I want to point out that kwin has very handy “switch to lower“ and friends shortcuts that can be defined. I prefer this over ctrl+tab actually.

Do you mean "Switch to Window [Above|Below|to the Left|to the Right]"? I'll give them a try, thanks!

yes, i use localised version of KDE so I'm not sure how those options are called in the english

I strongly recommend taking a look into other shortcuts of kwin. The selection of avaible actions is quite impressive.

sir_herrbatka wrote:yes, i use localised version of KDE so I'm not sure how those options are called in the english

I strongly recommend taking a look into other shortcuts of kwin. The selection of avaible actions is quite impressive.

Also Fvwm2 was configurable in every detail and I switched away for something that "just worked". But here I'm getting off topic, don't follow me