Plug-in icons

Hello, developers

How do you make icons for the plug-ins you have created?
Do you use Photoshop or something similar?
If you would like to share your method, please let me know.
thnaks.

I use Aviary (Aviary | Food4Rhino) to create icons inside a Grasshopper.

Also this might be helpful: On Icons | I Eat Bugs For Breakfast