I did just yesterday !
I was hacking on fluxbox and rebuilding the package to test directly on my system.
When I was happy with my changes I thought, I should write a patch for this…
But guess what ! With format 3.0 (quilt) it was already there, in the
debian/patch directory, just waiting to be renamed and completed with a nice DEP-3 header !
It is a lot more easy to contribute with those tools!
So thank you debian folks !