The template builder has several features to design your templates. You have the possibility to add illustration layer from the component library.
In this library you will have the choice to add an element of one of these components:
Feather - Open source icon
Twemoji - Open source emoji
Material icons - Open source icon
Undraw - Open source illustration
Add an illustration from a component
Click on the more button on the top bar
Select your desired component and insert it
A random element of the component is added, you can now change it with the switch illustration button in the right panel
You can change its color and opacity.