LOL, me too! It is very common in crochet to make a blanket of "grannie squares" - lots of crocheted squares then sewn together. By the time I made all the squares I think the last thing I'd want to do is sew them together.
If you do it by changing color all the time, you will then have a ton of lose ends to weave in so I guess sew seams, weave in ends - pick your poison, right?
An idea would be to make a blanket where difference TEXTURES lead to a patchwork effect. A very easy way would be to alternate blocks of stockinette and garter stitch, in a border of garter stitch. I made a blanket like this several years ago and, while not the most beautiful blanket in the world, it was nice enough and easy to work.