Combining scales with chords

I improv a lot. For me it all comes down to the notes present in the chord and pick a scale where they are all(or at least part of them) are present. Usually there are a bunch of scales I like, I also generally know which notes work over the chord so I usually just use those. Doesn't really matter whether they are all in the scale or not.

Hope that helps!

I may also have misunderstood your question

So I wrote a little clean chord heavy Intro melody and what I basicly did there was going through my scales and find chords within them. Then I transformed it Into an arpeggio. I think that's a pretty good way to get creative with your scales and chords.

The CAGED system. The CAGED system is so useful for this! You can relate scales with chords and even arpeggios too! The lessons on this site are great.

Improv can really help (with and without a backing track). Without a backing track is really helpful because your ear helps decide which notes sound best. Your goal without a backing track is to ensure that you can hear the chord changes even though there is no backing track.Theory at the end of the day is only theory, sometimes it is how it sounds too!

Also learning licks and solos from other guitarists (or other players) can help analyse where their thoughts were when writing.