The metropolitan line's seat pattern is a little too early 90s and stuck in the wacky 80s for me. Check out the London transport museum and you can buy various old patterns that have been restored and turned into various furnishings. I quite like the District's line Misha Black, circa 1978. I think the Blur painting (below) was used on the Modern Life is Rubbish LP
The Tube also do a nice range of shoes too.