Jen, just a 1.5 should be good, I think. But, if the 2.5 would work better for the measurements, then I would use that. Just something to break it up. I like the friendship star I think. Then if you want something for the next round on the ribbon/herringbone type thing, that would be good. It's just that I think 2 of the same "type" together gets too "busy". JMHO