A Periwinkle Problem

lornasperiwinkle
I don't think I have mentioned it yet, but recently all the volunteering I have done at my local library has started to pay off and I was offered a place on the relief panel for the library service (and hopefully this will lead to permanent hours!) 
Naturally being a knitter and a bit of a clothing addict, my first thought was the uniform. The corporate colours for the service are black and purple, I have plenty of black clothing, but inexpensively finding something purple for my outfit struck me as a problem, as I really didn't want to just go to Primark and get something really cheap. It occurred to me yesterday that I probably actually have some purple yarn that I could turn into a shawl or scarf or something to give me that pop of purple that I need. 
After a little Ravelry browse and then a rummage I found this Lorna's Laces Shepherd Sock Solid in Periwinkle. Now periwinkle is a bit of an odd one, being almost purple, almost blue, and this yarn does look more blue in person then the picture suggests but I think it will be fine for work. 
Now what to knit with it! I really haven't a clue at the moment. I had planned on turning this into socks originally, so I have two skeins, but I am sure I can get some more (probably not the same dye lot but I will manage) so do I go all out and knit my first cardigan, or stick to a little shawlette/scarf? 
Hmmm choices choices!