Creating and Publishing your custom icons for CRM entities makes your solution that much more professionally-looking.

There’s two ways to load your custom images onto CRM:

For On-Premise only:

upload your images in the CRM web folder called _imgs (default installation is at C:\Program Files\Microsoft Dynamics CRM\CRMWeb\_imgs)

For both Online and On-Premise:

make sure you add the images as web resources in a solution