Should we do unsolicited spec?

Last week an agency called New decided to try their hand at redesigning Wikipedia.

That's why we decided to spend two spring months on this project, looking for the ways how to make it better, reader or editor friendlier, clearer and aesthetically satisfying.

The project is called Wikipedia Redefined and we hope you will find this interesting.

Their effort got a lot of attention – including that of Brandon Harris, a designer at Wikimedia. He felt it was the wrong direction, completely.

It begs the question: Should agencies do unsolicited public spec work to get attention?