Funny you should ask...I am currently on a three-week trip and had given some thought to projects I could do while traveling. I brought materials to make a reversible quilt-as-you-go (which could also be done by machine) and have made several blocks so far.
One of our stops while driving was a quilt shop where I purchased a yo-yo maker and have done a bunch of them. Could only get the really small one so it'll be a doll quilt at best.
Then we went to a quilt show where the give-away was a set to make a flower using English paper piecing...and I decided this would be best of all. So I agree with many who already posted.
BTW on previous trips I did QAYG blocks with interesting quilting designs (shells) and cathedral windows that can be made into a tote bag.