The main problem is that if it isn't straight forward and easy to decide then I dither, and I dither and I ... dither! Can I make a shawl by knitting from 2 balls at one and stranding the unsued yarn up the side? No, I don't think so ... but maybe. Dither.
Can I make the shawl smaller by doing fewer repeats? Yes, but how will I know I have enough left for the edging? Dither.
Like the flower basket shoulder shawl (above) perhaps? Or maybe ... dither .
How about the forest canopy shawl (below), I like that one. Is there enough yarn in 2 balls for that? Dither.
On a more decisive note, *rolls eyes*, I am making progress on the lace shawl from VLT, although I have ground to a hault with K's cardi, even though I am on the sleeves and could probably finish this with an evenings dedication. Not sure I like the colour. Dither.
Did I say more decisive? Oh dear.
If I have a fiver for every time I've got the various shawl patterns out of their places to reread the yarn requirements I'd be a rich woman.
Moral? Buy more yarn than you think you need! Hah! That idea makes me smile. :o)