<p>A plain roundel at Moorgate.  There's some really elaborate ones on the tube – especially the early ones with borders around the blue strips and so on.  Alas all the ones I seemed to see were the plain, dull and simple type.
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For some background on this photo, see the <a rel="nofollow" class="external text" href="https://www.flickr.com/photos/bods/sets/72057594077939603/">Star Trek Tube Tour set page</a>.
<a rel="nofollow" class="external text" href="https://www.flickr.com/people/54741099@N00">Andrew Bowden</a> from London, United Kingdon
CC BY-SA 2.0
<a rel="nofollow" class="external text" href="https://www.flickr.com/photos/bods/110808144/">Moorgate Station Roundel</a>