LightDM: how to distinguish users with the same name?

I am using LightDM with the Slick Greeter. In my system, I have two user accounts for myself. They have the same name, but different user names. I want to separate private and professional work.

Problem: in the greeter, there is no visual difference between them. I only see the name (not the user name).

Hacky solutions:

• know the order of the accounts
• use different window managers (because they have different icons and they are visible next to the user name)

Obviously, all of the above solutions are plain out stupid. Better ideas? I am willing to change the greeter, but not the the session manager LightDM, neither my names (because they are used in other programs, such as email).