I really like the way the two go together. Not a perfect match with the same stripes on both, but they do go together. I love what you did with the "worms". It's so fun to add stuff like that to hats and with kids you can do it.
Another vote for the Vanna's Choice. I have not really made anything out of it yet (oh, a pair of booties, but not given to anyone yet), but I knit up a swatch with it and rubbed it around on itself and washed it, doing this four times. After four washing and quite a bit of abuse it still looks good. I think it is going to be a good yarn.