If you go by the "Knights of the Old Republic" interpretation, which is now semi-canonical:
Blue is the color of Jedi Guardians (sabre masters)
Yellow is the color of Jedi Sentinels (fighter/mages)
Green is the color of Jedi Consulars (Force masters)
And of course, Purple is the color of Jedi Pimps.
Seeing how Kyle was throwing all sorts of Force powers around, green is more fitting for him I think.
Our hearts are free from anger,
Our cause we know is just,
Kill not for joy or hatred,
We fight because we must.