Sharongn ~ Glad to have you join!
In the introduction to this BOM there is a link for “fabric pull” which states “Since I don’t know what each block is going to look like – it’s a mystery and the real goal of this block of the month is to learn techniques – I don’t know exactly how much fabric you should pull. My best guess is 2 yards of about 3 color families with the possibility to add or subtract fabrics from your stash.” There is a picture of the fabrics she has pulled to choose from with an explanation of her process. I hope that is helpful. I’ll bet many of us have the same ambivalence in trying to pick fabrics. It will probably turn out to be a bit scrappy in any event.
Here's something else she posted:
Choosing Fabrics
"How do you choose fabric for a mystery sampler quilt?
Well – my plan is to pull 1-3 main colors and an accent color. Since most of my quilts are fairly scrappy I’ll pull about 2 yards (which could be 8 quarter yard cuts or an equal volume of smaller cuts) of each color, while making sure I have other fabric in my stash I could add if needed."
Here's the link:
https://kimlapacek.com/2021/01/fabri...chool-bom.html