I am assuming the 5" squares of medical fabric will be the charms, and you are trying to decide on the sashing? Depends on if you are aiming for a calm quilt or a cheery quilt. The blue would calm down the entire quilt; red would enliven it. Between the reds, I actually prefer the solid over the little dots.
For those not familiar with the pattern, here is a link to a Youtube tutorial:
http://www.youtube.com/watch?v=4KkpbFKBaKA
The completed quilt is hanging in the background.