Currently, the SPE tile icon can only be changed for Windows 7 Operating Systems, by deploying the ‘Secure Password Extension Separate Tile Settings > Set tile image’ Administrative Template:
Password Manager 5.8.2 - Administration Guide (Managing Secure Password Extension Using)
An enhancement request (109579) has been created detailing the feature above: change the SPE tile on newer Operating Systems (Win 8, Win10…).
The product team will evaluate the request and this feature may become available on a future release of the product.
Please refer to this article for updates or contact support referencing the Enhancement Request ID: 109579.