Granddaughter wants a bobble hat - more than that, she wants me & her to have matching bobble hats, so we can be 'twins'... go figure!

Now, I have patterns for fairisle, cable, aran, baby patterns, grown up jumpers, cartoon patterns, even a couple of coat patterns - I have beret pattern, pixie hat patterns, gloves, socks, you name it......
Have I got a pattern for a simple bobble hat?? Nope!
I am a great knitter, but without a pattern, I can knit a scarf - thassit!
Anyone got a pattern that can be adjusted for size for a plain pull on hat that I can make a huge pom-pom for the top?
She informs me on the phone this morning that she has posted her Santy letter - she's asked for the regulation toys.... and 2 bobble hats - 1 for me & 1 for her....

I need to get these made for next week now, so if anyone has a pattern can you give me a shout?
I'd be ever so grateful!
Julie