If you think that drainpipes are a really boring and dull part of the urban landscape now you are going to probably change your mind. But, here you can see something completely different - an interesting concept of a drainpipe/flower pots in Seattle.

 
Here below another version of the same concept, still in Seattle:

 However the drainpipe that clearly wins hands-down a creativity challenge is the following one, the so-called Funnel-Wall at the Kunsthofpassage in Dresden, Germany:

Finally, a quite different concept, how to embellish a gutter pipe with a little bit of creativity. A work of Banksy, the British street artist with an international reputation: