You can configure your actions and personalize keys with custom icons. Use 72 x 72 pixels .jpg or .png files to achieve best results. You can also use animated GIFs.
Click here to access the Elgato Quick Start Guide.
Installing your Stream Deck Icons
To change the icon:
Highlight the Action or Key you want to change
Locate the Default icon on the bottom left corner of the screen (the location is highlighted in red in the screenshot above)
Click on the Default icon to select the image.
Drag your new image on top of the Default icon. Or, Right Click on the Default icon, and choose "Set from File" to select your preferred graphic.