Working on Over-The-Couch painting

This is the large version of the smaller "Three Crosses". I have done the textured crosses and am now going back and adding primer to the background. The primer is suppose to make the paint go further, and I could really use that help on this size canvas (I think its 20x30 or 30x40) I am debating whether to keep the background just like my original (it had the 3 background colors of mustard, red, and green separated) or do something totally different for the background (like turquoise and red??) Any thoughts??