Try the new Katia yarns where one 150g ball gives a shawl or various light garments.
Infinity Shawl yarn is 100% merino DK and has delightful 3-colour mixes.
Silver Paint gives more colours mixed with a golden sparkle. The 19% wool content allows cool machine washing to maintain the quality of your garment.
Funny Rainbow (100% cotton) uses multi-coloured with short repeat patterns to give a speckled finish rather than the thre-colour block in Spring Rainbow (50% cotton).
All the Katia yarns come with free patterns.
Do remember that sock yarn can also be used to make striking shawls: Head-over-Heels comes with a free pattern for a two ball project.