Inspired by the knitted slingshot... http://www.ravelry.com/patterns/library/slingshot
Chain 11, turn
SC in 2nd chain from hook, SC in each chain stitch
Chain one, turn, SC in each SC until long enough to reach around cup (I think I did 35 rows)
SC through beginning and ending rows to join
Turn work 90 degrees and chain 2
DC in the next 8 stitches
Chain 2, turn, DC in each DC
Repeat for 8 or 9 inches then join to the opposite side of the round the cup part
Add a SC border around the bottom edge for a bit more stability
