I designed this whole new icon library to replace our incredibly outdated old presentation library. I set the style to work against anything a user throws in the background - designed to be resilient and user proof. These icons get a lot of use in all company presentations.
They are showcased by our President Jack Dangermon at The Esri User Conference every year.
Below are just some of the icons that I created as a part of this library, the entire Meridian library contains over 1000 unique Icons
Each of these icons were designed by me in accordance with the style guide and with input from the Esri Icon team.