I have a simple solution. It may be the same as a couple of the responses above, so allow me to put is in simple terms...

Assuming you use collections,
1) Create a new, empty collection called ROTD (ride of the day) or similar
2) Open the track you want to see. Spanner, collections
3) Add the track ...

Garmin... This could all be as simple as adding a "clear" color track option for individual tracks.