To make a lap/single quilt 66" by 81" you need 783 charm squares.
Crib/wall 48" by 54" uses 378 charms.
Full/Queen 85" by 90" uses 1,110 charms.
King 103" by 102" uses 1,530 charms.
So I put aside the charm squares I had, and every once in a while I buy another one or two to add to my collection. To date I have approx 400-420.
By the time I have enough charm squares to make the quilt; and it might be queen or king size yet; I will have finished numerous other projects so I will have time to make this. The great thing about it is I will have a piece of all those lovely fabrics I admire in it without the huge cost of money and time to make a quilt from each range that catches my eye. I am using reproduction type charms for this quilt; but it would look fantastic in brighter, more modern fabrics too. I nearly started to put together two to make, but decided one was enough for the time being.
The quilt uses a template to cut the tumbler shape and then it is machine pieced.
I love tumber, clam shell and apple core quilts but decided on this tumbler one because I could machine piece it; however I may just take on making an apple core or clam shell quilt in the distant future!