@wertas
The F# major is not as easy to find open string ideas that work well since the open string are E A D G B E, which are notes outside of the F# chord tonality. But there are definitely ways to find good sounding lines over that chord when using the open strings as passing notes. The best thing is to experiment with it a lot and I'm sure you will find ideas that sound great! The B harmonic minor scale is a cool one to try out.
The Bm chord is easier to find open string ideas that will sound good. Try using the D major (or B minor, same notes) tonality and find descending and ascending lines.
I don't have a specific line to share that I can think of at the moment, but whenever I practice a specific tune or so, I find ideas myself by just experimenting!
Kind regards/E
