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Watching the recent Geoff Marshall video on the new Tyne and Wear Metro trains this looks to be great initiative to add some personality to interiors but also avoid a large white space which attracts graffiti. They've commissioned a number of different wraps from local artists which reflect the region.
This is something TfL could very cheaply do, hey you could even have them sponsored, and removes your graffiti problem instantly. If someone is determined to tag it then you can whack another one on and not have to spend money and time cleaning. The only other problem spot then seems to be on the white space on the doors, and of course exteriors but really this is something that needs to be tackled with BTP, especially when it comes to tagging with acid.
Something like this would really help lift the interiors of the Bakerloo and Central lines particularly and present a much more welcoming environment.
Screenshot above is from the video here
which is worth a watch.