I went to a class on Sunday and got this simply pattern. Although it is made on large (13) needles with Alp Premier, Dazzle or Light yarns (by Feza), you can make it on size 10 with worsted yarn. You would just make as many rows as you want, then make the ties - or not make the ties.
Cast on 25 stitches
K2, yo, k across to last 2 sts, yo, k2
That's it - you do this for as many rows as you want. It will make a "rounded" bottom.
For the ties, when you just about reach the length you want, place a marker and cast on 5 sts. Knit those five stitches, slip the marker, k2, yo, k across to last 2 sts, yo, k2. Turn.
Place marker, *cast on 5 stitches. Knit those 5 stitches, slip the marker, k2, yo, k across to 2 stitches before the marker, yo, k2, slip marker, k5. Turn
Repeat from * until you have 15 sts on the end of the needle (before the marker). Now, you can continue stitching the make the tie rows longer, but don't add more stitches onto the ends. Only your yo at the beginning and end of your rows as indicated in the main body of the shawl.
Also, you do not have to make ties, but just continue knitting in the main pattern until the shawl is as long as you want it to be.
BTW: The shawl stitched with the size 13 needles makes a delightful lacy shawl for dressy occasions or to wear to church on Sunday!