Janina Kallio of Woolenberry is a prolific and very popular pattern designer on Ravelry. Her easy one skein shawl patterns have been knitted by thousands of people, who have given her top reviews for these lovely designs.
Janina cleverly makes use of lace stitches which create shawls that drape and stretch, making them much easier to style as well as feeling like they're light and airy. Exactly what you'd want to wear on cool summer evenings or in air conditioned spaces.
Summer is wonderful for knitting small projects that are portable and not too difficult, am I right? Socks and shawls are my go-to for quick and easy.