There is already a big buzz about the Collaboration Mandala.. and lots of questions about yarn and hook sizes.
Perhaps you would like to share your plans and/or your questions here in this discussion — for easy reference for others, especially our beginner crocheters.
What yarn are you using? How many colours do you plan on using? What size hook?
Debbie (life & crocheting have a lot in common: it's all about one stitch at a time.)