The addition of track icons has been fantastic, but it really opens the door to this feature request: User Uploaded / Custom Track Icons.
The current set, while great, is insufficient. I already see other requests for adding to the icon set but no one set will satisfy everyone's needs or wants. We can already upload custom Template icons, custom Artist images, custom Song images and now define custom Color Pallets (amazing - yes!! thank you!!). Uploading custom track icons is the only logical thing to do here.
I was hoping and half expecting this in a 6.1 release once the basic feature was rolled out but it wasn't there in the end. I'm really hoping this can be part of the next dot release, whatever it might be.
Sorry if there is already another ticket for this. I did look and couldn't find any, though as mentioned there are slightly similar ones with a different focus on the request.