Help! I'm trying to find a mushroom tam knit pattern....

much like this one:

My son's counselor has really long dreads and has been known to wear these. Since he's been a blessing in our lives, I thought it would be awesome to make one (or 2) for him but I can't find a pattern to knit it by and I'm just not that handy at creating one myself. Yes, I've scoured the net and even emailed these folks to see if they would be willing to part with their pattern or convert it to one I could knit but haven't heard back.

The one in the picture is crocheted (which I'm sure you could tell already but I wanted to point it out just in case) and I was wondering if anyone had the special skills to create a pattern for me or knows someone who has one?

I've got the yarn, I just need the pattern! thanks!