tlrnhi ~ could this be the one that you are ??
I found the pattern at ezquilt.com
http://ezquilt.com/patterns/treeskirt/treeskirt.htm
they say you need to have a 'Companian Angle ruler'
BUT you can make it without (I have one, so used it) The block is 'Ohio Star' you make 8 of those and one LARGE (double the others). The center would be 24" and the 8 blocks are 12" Here is the link for a 12"
http://www.quilterscache.com/O/OhioStarBlock.html
I did two of these (for each of my DD's). For ONE- cutting and sewing was about 8+ hours, sandwiching, simple quilting about and another 8 and then hand binding the back side . . oh another 8 (I'm slow and take small stitches). So with life getting in the way and sleeping . . it can be done in a week.
If you need any more help just holler