Something is blue but I don't know what

I came out with the melody for this song during the last autumn while praticing Charlie Parker's "Now's the time". The chord structure is the same as "Now's the time" (standard F-blues with a little twist), the accompaniment is mostly done with 8 eights per bar: first, first, third, third, first, first, seventh, seventh.
The title is a joke on my knowledge on blues music when I came out with this melody. Hopefully now I know a bit more :D.
As my piano skills are not enough for playing these kind of rhythms the song has been exported in midi format from MuseScore and my Yamaha P-155 digital piano played it.

Listen the song here: