I've made a note of it before:
Some gnome/adwaita based apps have their own built in window dressing which sort of "doubles" with the Elive theming.
To keep the Elive experience a bit more coherent we should try not to use those apps i.e find replacements.
'gnome-taskmanger' is one of those apps and while awaiting a finished EFL version we should consider using 'xfce4-taskmanager' or 'lxtask'.
Personally I think 'lxtask' is the nicer of the 2. It has a nice minimal, no-nonsense look to it.....here's a comparison:
- On top is xfce4-taskmanager and lxtask is below.