NOTE: Considering the size hook used, I'd be tempted to use Aunt Lydia's size 3 crochet thread
3 balls cotton crochet thread size 10 Green
2 balls cotton crochet thread size 10 Yellow See Note About Threads
Size 0 Crochet Hook
Measures approximately 11 1/2 by 18 inches
Starting at long side with one strand each of yellow and green, ch 102.
1st Row: Sc in 2nd ch from hook and in each ch across. Ch 3, turn.
2nd Row: (this is the right side): Drop yellow loop from hook, with green, holding back on hook the last loop of each dc, make 2 dc in first sc, thread over and draw through all loops on hook (cluster made) - make a 3 dc cluster in next sc and in each sc across. Crop loop from hook.
3rd Row: Pick up dropped yellow loop at beginning of previous row and sl st loosely in the tip of each cluster across. Pick up the dropped green loop at end of previous row. Working with one strand of each color, ch 1, turn.
4th Row: Sc in tip of each cluster across. Ch 3, turn. The 2nd, 3rd, and 4th rows constitute the pattern. Work in pattern until 19 cluster rows have been completed. Repeat 4th row once more. Cut thread. With right side of work facing, use one strand of green, sc closely along each side edge. Cut off thread. Weave in ends. Block to measurements.