G hook, 100% crochet cotton yarn.
Row 1: Chain 25, DC in 4th ch from hook, and all the rest to end.
Row 2: Ch 3, dc in each st to end.
Continue Row 2 until you have 10 rows (or a good rectangle)
Border. (optional, you could stop now and finish off)
Using each dc as two stitches down the side.
Side Border: Chain 1, 2sc in first st and all down the side. 3sc in corner.
Bottom Border: Sc in-between each st across the bottom. 3sc in corner.
Repeat side border for other side.
Repeat bottom border for top.
Sl st in first sc. finish off.
Ch 1, reverse sc in each sp across and 3 in each corner.
2sc in each stitch down each side. sl st in first sc.