The Duchess Lace Stitch is perfect for an heirloom blanket.
This closed stitch is perfect for a blanket that has texture but no holes.
Mini Bean Stitch
The mini bean stitch gives texture and is also a closed stitch.
Corner to Corner
The Corner to Corner technique (c2c) is a classic that works up quickly.
A simple V-stitch is a slightly open texture that's still warm and gives amazing drape.