Krita at least can use any Qt theme installed on your system, so you can make it look like that (and actually i think even that specific theme is ported to Qt5).
I use a theme called "CDE-esque" that adds little bevels where appropriate. It isn't really CDE/Motif, if anything it is closer to Plastique (which i think is the theme in your linked shot) but it isn't overly flat either.
The icons are still monochrome but they look distinct enough for me to not bother me (and i tend to use the shortcut keys for most things anyway).
I use a theme called "CDE-esque" that adds little bevels where appropriate. It isn't really CDE/Motif, if anything it is closer to Plastique (which i think is the theme in your linked shot) but it isn't overly flat either.
The icons are still monochrome but they look distinct enough for me to not bother me (and i tend to use the shortcut keys for most things anyway).