I believe most people have a few go-to lines that they play a lot. Lines or fills that they can always rely on to work for them. I'll start.
I play root-fifth-octave A LOT because you don't have to think about it as the root and fifth are in most standard chords.
In minor, I like to add the seventh and third. Simply because they always sound cool!
The diminished fifth is one of my tasty notes to, well, add some taste

For example in A minor I would play a short Eb followed by the rest of the line. In C major I would also use the Eb.
I think these are pretty basic and are used a lot. Post yours and let's see what you do!