@ alewgro Adam, first off, my apologies for regurgitating the duff info regarding changing clip background colours using the Clip Inspector.
The last few posts in this thread have made me realise that my background colours are indeed a legacy of the Colours profile I created in X2. I honestly didn't even know that facility had been removed in X3 and now in Plaitinum, hence my confusion.
My eyesight too is not wonderful - generally speaking I start to struggle in low light conditions, but specifically I have a big problem with discerning low contrast views and images. As you will no doubt understand, the original X1 colour scheme consisting of little more than a homogenous sea of various shades of grey was a nightmare for me.
Currently, I find the almost unnoticeable colour/contrast changes that indicate which track is selected in the Track View Pane to be a big problem. Back in 8.5, I had the colours set up so that when I selected a track, the result was a virtual 'negative' of everything else on the screen, not just for the Track Pane itself, but for any Clip/s selected in that track. In this example, the grey background of Track 12 turns yellow (and the Track number goes bright blue), and the clip background turns black with a yellow waveform:
With X2 onwards, I've refined my templates with the (extremely useful) ability to colour code tracks and busses, all geared up to help me discern various parts of the GUI more easily (Drums = Blue; Demo/Scratch Track = Brown; Bass = Black; Rhythm Guitars = Red; Lead/Harmony Guitars = Green; Master Bus = Yellow):

As far as making it more obvious to discern selected tracks and clips, I've tried to accomplish something akin to the way I had it in 8.5, albeit with the added advantage of colour coding.
By default (and what I must have set up pre X3), all the audio track clip backgrounds are yellow, and the waveforms follow the track colour. When a clip is selected, the header turns blue and the background goes light blue. The only way I've found to accentuate the colours/contrast in the Track Pane is to have the track's number go bright yellow. I'm afraid that the current set up whereby the name of the track changes from

to

just isn't good enough for me.
Here's how a selected clip/track appears in a project:
Having the ability to have the track pane change colour to mimic the selected track/clip colour would be nice: