Hello,
Firstly I'd like to tell you I'm quite new to Training Peaks and it's been a revelation. Being focus on the essential, and having a clear view on the calendar & workouts is absolutely great. (unlike strava or garmin where it's messy. Also, all these useless badges don't help at all).
I enjoy every component on Training Peaks and it really helped me reach a next step in training and sport overall.

Using a lot the calendar an pre-made workouts I realized something was kind-of missing I'll try to explain it :
-When you have a pre-made workout on your list the colour is grey.
-When you put an undone workout for the next day for example it's still grey because it's not fullfiled.
-When you complete your workout on garmin in sync with TP or manually complete the workout then a color appear : green (workout done as planned) orange, red etc.

I was thinking of a feature :
-Would it be possible to add colours to undone workouts, even add colours to workouts in the list ?
-Would it be possible to choose between keeping the initial color when the workout is done or changing the color to green if effective or orange or red (as it is right now)

Why am I asking this ?
-Some workouts are endurance focused, some are HIT focused, some are middle strenght focus, some are tempo focus etc. And each training needs a specific rest time. For example it's very unwise to make a HIT training every day for an entire week.
So by adding specific colours you can see within the blink of an eye how the week will be organized and when it will be hard and when you'll have time to rest.

I have some pictures and further explanations are available on them.(sry I'm not very good at it) Also english is not my native language so forgive me in advance if you need any further explanation I will gladly answer & help.