You would like to have the ability to import an image for the icon selection and then use the imported icon for the Dashboard Command List under the Data Tab for the Item.
1. Launch Configure Application
2. Click on the Home page
3. Under Branding, click on Image Manager
4. When the dialog pops up, click on Add
5. Browse to your image and save
6. Refresh the Browser and you should see it within the Dashboards