Tint2 is the panel we use in ArchLabs. It can contain the application icons, workspaces, active applications and system icons.
Tint2 is super customisable and easy to use with the tint2 Gui.
It is here that you select a theme and apply it with the button in the menu. If you apply it, the current ~/.config/tint2/tint2rc will be overwritten. A backup of this file will be created.
A double-click will make a copy to your ~/.config/tint2 folder where you can edit the tint2 file locally on your home folder. After editing you can decide to apply it or not.
It just takes some practice to get the hang of it when you want to theme it yourself as there are many elements you can change in a tint2 panel.