This is currently the number 1 question in my Top 10 of most asked questions; "is there are pattern for that crochet blanket you have?". I don't know to be honest. I did have a proper look at my blanket and made something up that quite resembles it and it's working for me. There must be other, maybe better, variations but I can only share the one I made with you today.
These are the stitches I use:
dc = double crochet
ch(s) = chain(s)
sl st = slip stitch

I first start make a bunch of circles using 3 colors. Here's how to make the circles:
Color one, round one - ch 4 - sl st in first ch (you now have a wee circle) - ch 3 (this is your first dc) - 11 dc in the circle (having a total of 12 dc's) - sl st in third chain of the first dc - cut.
Color two, round two - ch 3 between first and last dc of first round (this is your first dc) - 1 dc - 2 dc between first and second dc of first round - and so on until end - sl st in third chain of first dc - cut.
Color three, round three - ch 3 between first and last dc of second round (this is your first dc) - 2 dc - 3 dc between first and third dc of first round - and so on until end - sl st in third chain of first dc - cut.

How to make your first square:
ch 3 between your first and last dc of the circle (this is your first dc) - 2 dc - ch 1 - 3 dc - ch 1 - 3 dc - ch 3 - dc 3 (between the same dc's) and so on - sl st in third chain of first dc - cut.
Now you want to start to work the circles into the blanket:
I have to stop here as it's getting too complicated and I'll have to make a movie of this as it's too hard to describe. So 'Crochet a Blanket The Movie' will be here sometime next week.
Maybe you can have a look at the pictures and figure it out for yourself, as I always do with crochet. Otherwise you'll have to wait for the movie as it's so much easier to show you what I do instead of writing it down. I thought I could do it but I can't.

Have a lovely (almost) blanket and weekend.

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