There are lots of heart-themed ornaments in 55 Christmas Balls to Knit. It must be a common motif in Scandinavian patterns.
Nomadic Notions, I might just have to go back for more. Now that I've finished it, I think it might have been interesting to have two of the hearts outlined in clear/white beads. I'll keep that in mind for future patterns.
There are two more heart patterns in the chapter, but they'll have to wait until later. This week has been filled with yard work and I've been snagging bits of knitting time here and there when I can. It's warmed up quite a bit, and knitting on these little things is much more appealing than sitting with the vest on my lap.