It takes time, and patience, and again a lot of time... It's a relaxing thing to do in the late evenings. You don't have to think or count, you can just keep on crochetting these blocks. The only thing you have to worry about, is your colour choice. The rest are peanuts.
I still enjoy the fresh colours of the summer. My blocks are made from 100% cotton yarn. I am planning to crochet enough of those to make a blanket. I know, it is not going to give a lot of warmth, but it's planned for pure decorative goals.
I guess it would be lot of fun to combine all these blocks in different colours in one blanket.
Have a great day!