Smiling Colors has a great tutorial for a Half Linen Stitch blanket, which she worked with a multicolored yarn but you could absolutely do as a stash-busting project instead (blankets are my favorite stash-busting projects).
She offers tips on how many stitches to cast on and how long of a needle to use, as well as how much yarn her project used if you want to estimate from that to make a bigger one.
Check out the free pattern and tutorial over at Smiling Colors.
[Photo: Smiling Colors.]
Looking for more Blanket Patterns to Knit? Check these out on Etsy.