The only thing I can tell you is, get familiar with you diminished chords(including half diminshed) and your tritones.
Say for instance, in the key of Db, you have, (I'm working on my theory so, excuse me.)
Db/Ab-Db-Eb-Ab DbM9
F/Ab-C-Eb-Ab Fm7
Bb/Ab-C-Db-F Bbm9
Eb/Gb-Bb-Db-F Ebm9
Ab/Gb-Bb-C-F Absus13? lol
Db/F-Ab-C-Eb DbM7?
Thats a pretty nice progression in it's self, right? Try this:
Db/Ab-Db-Eb-Ab DbM9
C/E-Ab-Bb-Eb C7#9?
F/Ab-C-Eb-Ab Fm7
C/Bb-Eb-G Cm7
F/A-Db-Eb-Ab F7#9Bb/Ab-C-Db-F Bbm9
D/Ab-B-D-F DdimEb/G-Bb-Db-F Eb7add9Ab/Gb-Bb-Db-Eb Ab/GbM6
--/Gb-A-C-Eb Ab/Cdim7Db/F-Ab-C-Eb DbM7
The bolded chords are ones that are changed or added in.
Now its pretty, churchy, and somewhat jazzy at the same time.
Check this "groove" out Its a slow count:
[1 2 3 4]Bb-F/Ab-C-Db-F Bbm9
[1 2 3 4]F-C/Ab-C-Eb-G Fm9
Now with some tritones:
[1 2]Bb-F/Ab-C-Db-F Bbm9
[3]F-B/E-A-Db
[4]E-Bb/Eb-Ab-C
[1 2 3]F-C/Ab-C-Eb-G Fm9
[4]A-Eb/Ab-Db-F
*repeat
See that some "flava" was added when the tritones are played.
But yeah, play with your diminished chords, tritones, minors(7 9 and so on)
Hopefully this helps