I'd give you a small $5 donation via paypal if you make a .AI file with each individual brush that could change color and look pretty! Plz because I don't understand how to use a .pdf in illustrator yet! Thank you!
I downloaded the PDF as well and in Adobe Illustrator I could use them by opening the library of brushes and then add in the PDF file. It worked just fine. So just give it a go people Illustrator works well with pdf's just fine