What to knit for teenagers nowadays?

Our weather is getting colder and we have had 2 weeks of winter-ish rain and temperatures. Now that the socks are finished and the possibility of more Oscars and Carolines to be made,
have been looking to knit something for DS and DD who are now fashion conscious teenagers. I'd like to make something practical for washing without looking too fuddy-duddy. Have been thinking of designs with a bit of 'tude that won't end up at www.youknitwhat.blogspot.com.
(I think I have a simple slim fit cable sweater in mind for DS.)
Even our dog needs a new jumper!