Since theming for MATE is pretty tough rn, went with a simple theme; Adwaita Dark from opendesktop.org and Menta title bar. (If I can find a left variant of that, it'd be p nice.)
Wallpaper and icon theme from Pop!_OS, a recent system I had tried to use long-term, terminal is terminator (which FYI modded MATE menu to execute via
x-terminal-emulator) and the rest is just my panel config. Not really themed up with custom icons (working on that), nor had I riced the term out with anything special. Basics.
About that panel setup;
Yeah, separators on the top are pretty messy. If MATE could have configurable spacers in the future that would be kinda sweet. Also pretty swell could be drawer offset, so when a drawer is opened it's independent of the drawer icon. Other than that it's a fairly nice setup with a handful of applications in the same panel where I keep my libraries for quick launching and overall it's a good conceptualization of how a panel environment can be utilized in the hands of someone who knows what they're doing, somewhat.