RGB Rainbow collar - $3.99 each!
If you stand far enough from your screen and let your eyes unfocus, it does look like a rainbow. Sorta.
Added a rainbow in the background, fixed the schnauzer, and added a background.
i think in sted of mixing large and small pixels you could make the large pixels with raindbow dithering like the collar.
removing from challenge due to lack of rainbow. pm a mod if revised.
Not sure whether to call this lazy or genius pixelling. I feel you could have used your palette much better.