As you can see here, I have completed the second tile by accepting an answer to one of my questions. However, there is no indication of this accomplishment unless I physically mouse-over the tile and look at the text to the right:

![enter image description here][1]

I'm *guessing* this is a [tag:bug] since one would expect the tiles to turn blue or something when completed. If this is *not* a bug, then I humbly propose it as a [tag:feature-request].

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**Edit:** this must be a bug. [The actual sprite used in the CSS](http://cdn.prom.sstatic.net/MissionPromo/Windows8/img/sprite-tiles.png?v=2) contains two rows of images - one light grey (as pictured above) and one blue.

  [1]: https://i.sstatic.net/X2Gz2.png