Organists who like to play jazz and blues on the organ (yes, that's possible and perfectly legitimate!) use the Blues Mode all the time. Watch this video and I hope you will feel compelled to incorporate it in your organ playing.
It's fun but I don't advice it for Communion and other parts of the liturgy (unless you know how to create a religious feeling with it) because it has a certain worldly association with it (except when it comes naturally for your denomination). However, it could be used for concert music very effectively.
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Our Hauptwerk Setup:
Drs. Vidas Pinkevicius and Ausra Motuzaite-Pinkeviciene
Organists of Vilnius University , creators of Secrets of Organ Playing.
Don't have an organ at home?
Download paper manuals and pedals, print them out, cut the white spaces, tape the sheets together and you'll be ready to practice anywhere where is a desk and floor. Make sure you have a higher chair.