Made with the Diagonal Box Stitch
Finished Size: 7 3/4 inch square
Materials: US size H hook, 1 1/2 ounces worsted weight cotton (I Love This Cotton, Christmas Print was used for example), Tapestry needle for weaving in ends.
ch 6
Row 1: dc in 4th chain from hook, dc in each of next 2 ch (box made).
Row 2: ch 6, dc in 4th ch from hook, dc in each of next 2 ch, turn box made in row 1 over so that the wrong side is facing up (see Fig. 1), sl st in top of beg ch 3 on row 1, ch 3, working along end of row 1, 3 dc in ch 3 sp (see Fig. 2), turn.
Row 3: ch 6, dc in 4th ch from hook, dc in each of next 2 ch, sl st in top of ch 3 of last box made on previous row, ch 3, 3 dc in ch 3 sp, sl st in top of next ch 3, ch 3, 3 dc in ch 3 sp, turn.
Row 4: ch 6, dc in 4th ch from hook, dc in each of next 2 ch, sl st in top of ch 3 of last box made on previous row, (ch 3, 3 dc in ch 3 sp, sl st in top of next ch 3) twice, ch 3, 3 dc in ch 3 sp, turn.
Row 5: ch 6, dc in 4th ch from hook, dc in each of next 2 ch, sl st in top of ch 3 of last box made on previous row, (ch 3, 3 dc in ch 3 sp, sl st in top of next ch 3) 3 times, ch 3, 3 dc in ch 3 sp, turn.
Row 6: ch 6, dc in 4th ch from hook, dc in each of next 2 ch, sl st in top of ch 3 of last box made on previous row, (ch 3, 3 dc in ch 3 sp, sl st in top of next ch 3) 4 times, ch 3, 3 dc in ch 3 sp, turn.
Row 7: ch 6, dc in 4th ch from hook, dc in each of next 2 ch, sl st in top of ch 3 of last box made on previous row, (ch 3, 3 dc in ch 3 sp, sl st in top of next ch 3) 5 times, ch 3, 3 dc in ch 3 sp, turn.
Row 8: ch 6, dc in 4th ch from hook, dc in each of next 2 ch, sl st in top of ch 3 of last box made on previous row, (ch 3, 3 dc in ch 3 sp, sl st in top of next ch 3) 6 times, ch 3, 3 dc in ch 3 sp, turn.
Row 9: ch 6, dc in 4th ch from hook, dc in each of next 2 ch, sl st in top of ch 3 of last box made on previous row, (ch 3, 3 dc in ch 3 sp, sl st in top of next ch 3) 7 times, ch 3, 3 dc in ch 3 sp, turn.
Row 10: ch 6, dc in 4th ch from hook, dc in each of next 2 ch, sl st in top of ch 3 of last box made on previous row, (ch 3, 3 dc in ch 3 sp, sl st in top of next ch 3) 8 times, ch 3, 3 dc in ch 3 sp, turn.
Row 11: sl st in each of next 2 sts, sl st in top of ch 3 of last box made on previous row (see Fig. 3), (ch 3, 3 dc in ch 3 sp, sl st in top of next ch 3) 9 times, turn.
Row 12: sl st in each of next 2 sts, sl st in top of ch 3 of last box made on previous row, (ch 3, 3 dc in ch 3 sp, sl st in top of next ch 3) 8 times, turn.
Row 13: sl st in each of next 2 sts, sl st in top of ch 3 of last box made on previous row, (ch 3, 3 dc in ch 3 sp, sl st in top of next ch 3) 7 times, turn.
Row 14: sl st in each of next 2 sts, sl st in top of ch 3 of last box made on previous row, (ch 3, 3 dc in ch 3 sp, sl st in top of next ch 3) 6 times, turn.
Row 15: sl st in each of next 2 sts, sl st in top of ch 3 of last box made on previous row, (ch 3, 3 dc in ch 3 sp, sl st in top of next ch 3) 5 times, turn.
Row 16: sl st in each of next 2 sts, sl st in top of ch 3 of last box made on previous row, (ch 3, 3 dc in ch 3 sp, sl st in top of next ch 3) 4 times, turn.
Row 17: sl st in each of next 2 sts, sl st in top of ch 3 of last box made on previous row, (ch 3, 3 dc in ch 3 sp, sl st in top of next ch 3) 3 times, turn.
Row 18: sl st in each of next 2 sts, sl st in top of ch 3 of last box made on previous row, (ch 3, 3 dc in ch 3 sp, sl st in top of next ch 3) twice, turn.
Row 19: sl st in each of next 2 sts, sl st in top of ch 3 of last box made on previous row, ch 3, 3 dc in ch 3 sp, sl st in top of next ch 3, turn.
Border: ch 1, sc in first st of last box made, ch 2, dc in same sp, skip next 2 sts, [(sc, ch 2, dc) in top of next ch 3, skip ch 3 sp, (sc, ch 2, dc) in first sl st of next box, skip next 2 sts] 5 times, [(sc, ch 2, dc) in top side of 3rd dc of next box (see Fig. 3), (sc, ch 2, dc) in free loop of 1st ch of next box] 5 times, [(sc, ch 2, dc) in bottom side of 3rd dc of next box (see Fig. 4), (sc, ch 2, dc) in free loop of 1st ch of next box] 5 times, [(sc, ch 2, dc) in top of next ch 3, skip ch 3 sp, (sc, ch 2, dc) in first sl st of next box, skip next 2 sts] 4 times, (sc, ch 2, dc) in top of next ch 3, skip ch 3 sp, join with sl st in beg sc, fasten off, weave in ends.
Fig. 1
Fig. 2
Fig. 3
Fig. 4
Closeup of Diagonal Box Stitch
Here's one where you can see the diagonal effect a little better.