Melodic Minor with mayor scales

[ronaldor]

I wonder if when you are playing a C major chords you can use a Melodic minor mode.
I know that the relativ minor of the C major scale is A minor.
When you play A minor I can use A melodic or E melodic but when you play the C major its sound to me that it does not sound good. Is there any formula for playing a minor melodic with mayor chords.
Could it be so easy as playing the 6 note Aeolian mode of the mayor scale with a raised 6th and 7th note.
My best regards for all of you Ronald