I say it depends on how good you are at putting together combinations of fabric.

It's not that easy to put together a charm pack of every square perfectly the same size and with at least 20 different fabrics to make a charm pack of 40 + squares. I made up a few charm packs for a sale table and when I was done I thought $20 per pack was a bargain! LOL I won't make any more and sell them for $9. Not worth the effort.

I think they need to have some sort of focus. I have bought many charm packs that are not from one designer but they go together well. Good Luck.

....organic...? Explain, please...thanks

Sounds like you're all set. If I were going to make up charm packs I'd do 42 per pack and then as you said, keep them complimentary to each other or theme oriented or something that makes them unique. Much success to you.

If I had a choice I would rather buy coordinating packs rather than designer packs. Good luck with it! I've been buying packs on ebay and find the designer packs sometimes have the same theme but IMHO don't coordinate that well.

if the price was cheap enough, i'd buy a non co-ordinating pack of them. what does organic mean?