What about doing a cowl? It's not as long as a scarf (so you probably won't get bored stiff with it), and you can do some easy (or more complicated) lace if you want to try that.
You can make cowls huge or just small enough to fit over your head, and you can either make them in the round or a long rectangle with buttons at one end to complete the circle. They are definitely fun and a quick knit. I just finished one using this pattern.
There are some other, non-lacy patterns for cowls, too. But my general advice for finding what's next to knit is to that you look up random categories of patterns on Ravelry. If that doesn't inspire you to make SOMETHING, nothing will!