I came out with a sort of 12-bar-loop, but it's not one "classical blues progressions", like these: https://en.wikipedia.org/wiki/Twelve-bar_blues#Variations
Here's the harmonic pattern:
1 2 3 4 Bm D A G F# Bm D A G F# Em D-1 Em A F#
where "D-1" still means D major, but one octave below the other "D" used before.
I was wondering how that would sound to you (say with swing or bossa nova @100 BPM), if it's something already used before, and so on: feel free to provide any feedback.