I find people are pretty evenly divided about crocheted blankets - they either love them or hate them. I love them. I love the weight and the textures and I especially love the way they lend themselves to geometric patterns. They are a little like fabric quilts in that respect. I have made two crocheted blankets this year and have a couple more in progress. Here they are all together:
200 Crochet Blocks for Blankets, Throws and Afghans: Crochet Squares to Mix-and-Match by Jan Eaton which I have used many times - it has a wonderfully varied selection of blocks and some great ideas for how to put them together. Most of the squares have been crocheted on the train, so it feels like it has taken no time, since that time is otherwise lost. I have a pile of 20-30 more to add and then it will be done, all bar the edging.
I think this blanket's simple design shows off some of the things I love about crochet - there are at least 2 patterns there: one from the arrangement of the coloured blocks, and another from the eyelets in the blocks themselves.
a baby afghan that appealed to me, so I took the basic granny chevron pattern and came up with this. It grew very quickly and was very satisfying. It's really a lapghan - big enough to cover either your lap or wrap around your shoulders. It's surprisingly light and comfortable. Again, the acrylic yarn is an advantage because it has had tea spilt on it at least twice and it has washed up very well. I love the pattern - I want to use it again.
Attic 24's wonderful Neat Ripple Pattern. This one grew so quickly I think it was done in 2 weeks of an-hour-an-evening while I was watching tv. It's a full single-bed size so it has been used for snoozing under on the sofa. It lives in the lounge and gets a lot of use.
Lakeshore Plaid Blanket by Ana from Lanas Hilos. I can lose many, many hours on Pinterest - but that's a story for another day.