Background lights I've not done a good job with, there were songs last year where I only turned on the floods a couple of times at all. Sequences like the one Zwiller does over on diyla and on Falcon that really, really show off what you can do with a few floods as one of the central elements of the show is more where I think we need to look at using them rather than just thinking of the house as a canvas.
But I know exactly what you mean with the lack of oompf, running the Aether II units which are 34-40 watts each and run a bit over $100 built and installed into those 500 watt halogen light cases. This year I hope to deploy a dozen or so 10 watts to also fill in a few more spots (PUN THERE) and get a better effect as you were talking about. Saw some amazing videos where the colors were great, the distance and fill was an effect in itself.
Maybe today go out and put a few out for St. Patrick's day for the week.