please empty your brain below

Line colour bingo?
Northern
The line colours are all in approximate proportion / location to (one of) their outer extremity/ies. Very clever. But i can't work out what the light pink refers to - perhaps just a filler with an unused shade?
Hammersmith & City
Perhaps it's subtly asking 'What colour could be used for Crossrail 2'?
Pink must be H+C, although it would have equal billing with the Circle.
Presumably each of the tube lines (10) + London Overground (1) + Crossrail (1)+ the DLR line colours (3).
There's the design concept for a whole shop's worth of TfL branded stuff for Christmas - mugs, doormats, scarves, dog collars... I hope you register this design PDQ DG.
Eleven Tube lines, Tramlink, Overground, DLR, Crossrail ?
@PoP, it's the 15 colours from the rainbow board, except with Crossrail purple in place of TfL blue.
Oh god. It's the signal.

Good luck everyone - I hope most of you make it through.
Wot, no Dangleway?!
The next randomiser for once the pack of cards runs out. I've already guessed Northern as the first entry because on Feedly the (largely-empty monochrome) grid has an unexpected ampersand in that slot.
Ooooh errrr! If this is a sample of the new wallpaper you're thinking of putting on your bedroom wall, you should think again,DG. You'll never get to sleep with paper that loud! 😂😂😂
On my pc each box has a Victoria blue line through the middle (if you click highlight the blocks) apart from the far right column which has the blue line at the top of the box instead - any of which may or may not be significant!

Also, when you then click on the comments box, the blue lines turn Jubilee grey!
@Cornish Cockney - I think there may be hidden text in each box - to be revealed by DG in due course?
Comment-bait. Must be trying to up the average number of comments.
...Elmer?
@shirokazan - If that's the way you feel why join in? You must have an interest here if you keep visiting, so why be so mealy-mouthed.
Only got 3 blue lines, others are white except for last column all with nothing.

Checked against the Tfl underground status updates and can't see a connection so now I think I'll just wait!
.....Mornington Cresent.
Run you mouse pointer over each colour in turn. Where the pointer changes, double-click. A horizontal bar appears.

For the three right-hand boxes, the bar is at the top of the box. For the rest it is in the middle.

All the bars are white, except for H&C, Circle and W&C colour boxes where the bar is dark blue.

There is no writing in the bars, although if you 'Inspect Element' there are messages about "notifying visitors about cookies' and 'The quick brown fox jumps over the lazy dog'.

All very mysterious.
I think the response to clicking this diagram evidently varies from user to user (or browser to browser, or, for all I know, from bruiser to snoozer).
For me the response is sometimes in the box to the right of the one I double-click in.

However, it is my guess that DG did not deliberately program this behaviour, it is an artifact of the software used to make the page or used to serve up the blog. Only a guess, though, but I would point to his main (or only) message being the line colours, and the ends of various railway lines on a map of London, particularly as we know that DG has form for interesting displays of geographical data in a rectangular scheme.
There is a 'name that station' game in this: Which station is common to each pair of adjacent squares going across / down / diagonally? - e.g. starting from top left: Purple+silver=Finchley Road, silver+black=London Bridge, etc. etc.

There are a few that don't connect with an interchange, but considering the geographical limitations of TfL Rail, Waterloo & City and Trams, surprisingly few.

Perhaps it could be used as a strategic planning tool for developing the network in the future - e.g. connecting Victoria and Elizabeth!
You actually had me until the comments page!

Would not have at all been surprised, sadly, if this was a real TfL press release...










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