Peruvian alpaca

Hmm, after all my alpaca yearnings yesterday, it seems weird that I should be gifted with some today. Oh, yes, you heard me right. I am now the proud owner of two balls of genuine Peruvian alpaca blend yarn. One of my friends has just returned from a once in a lifetime round the world trip and was wonderful enough to get me some yarn whilst she was in Peru. I asked her to get me any yarn, any colour as long as it was the same stuff that the locals use rather than the stuff that we get over here. And look what I got- one ball of green and one ball of white:

There's a 100gs worth in each ball and it looks to be about a 4 ply or maybe a little thinner. It's an alpaca/acrylic blend that's knits to a tension of 15 stitches and 20 rows over a 10x10 cm swatch on number 5 needles. Oh, and it was produced in Lima.
The two things it doesn't tell me is the percentage blend (though it does have good washing instructions) or the yardage. I'm estimating it at about 400m a ball which seems to be standard for a 100g of 4 ply sock yarn.
I have yet to come up with any good ideas as to what to do with it (answers on a postcard please) though I'm kind of thinking of maybe doing lace shawl over Christmas. I feel as though I should try and make something special out of it that I can keep for a while, after all my friend went to all the effort of carrying it around the world for me!