The Teen Titans have had no shortage of failed pitches. After the failed Judas Contract movie, both Dick Grayson and Raven were also denied proposed live action TV series on the CW. Turns out the two were also denied the opportunity to star in an animated series. In 2009 a pitch was put in for a Nightwing series. By the looks of designs posted by the artist, the show would have had a less cartoony look than the Teen Titans series.
While Nightwing maintained a traditional design, similar to his eventual Young Justice look, Raven traded a cloak for a more grounded hoodie look.
Tragically, this was yet another series for which the the fates failed to align and only our imaginations can tell how great this series could have been.