Delta now supports colored as well as monochrome icons! Please note that this is a PRO feature. You can learn more about PRO here.

To switch, head over to Settings -> View Options (or click here) and turn on/off "Monochrome".

Enjoy!

PRO TIP: You can quickly change in and out of monochrome mode by tapping on the Monochrome button. To find this, go into Settings (or click here) and then press the button in the top left (to the left of the light/dark mode button).

PRO TIP 2: If you want to change to light/dark mode in Delta, you can follow this guide here.