The Corner to Corner Stitch
(formerly called Crosshatch from the Corner)
A fun little design pattern that allows you to build a square from the corner, working on a diagonal, instead of straight horizontal rows.  It is a great design pattern for using up those scraps lengths of yarn or thread, by changing the color for each row.

INSTRUCTIONS:
Row 1: Ch 5. Work 3 Dc into 5th ch from hk. 1st Little Block completed. (4 sts total; 3 Dc + 1 Ch loop)
Row 2: Ch 5. Work 3 Dc into 5th ch from hk. (Turn work so current Little Block is in line with previous Little Block.)  Sl St into Row 1 Ch loop.  Ch 3. Work 3 Dc into Row 1 Ch loop. {2 Little Blocks completed.}
Row 3: Ch 5. Work 3 Dc into 5th ch from hk. (Turn work so current Little Block is in line with previous Little Block.)  Sl St into Ch loop of previous Little Block.  Ch 3. Work 3 Dc into same Ch loop.  Sl St into Ch loop of the next  Little Block of previous row.  Ch 3. Work 3 Dc into same Ch loop. {3 Little Blocks completed.}
Row 4: Ch 5. Work 3 Dc into 5th ch from hk. (Turn work so current Little Block is in line with previous Little Block.)  Sl St into Ch loop of previous Little Block.  Ch 3. Work 3 Dc into same Ch loop.  Sl St into Ch loop of the next  Little Block of previous row.  Ch 3. Work 3 Dc into same Ch loop.  Sl St into Ch loop of the next  Little Block of previous row.  Ch 3. Work 3 Dc into same Ch loop. {4 Little Blocks completed.}
Row 5: Ch 5. Work 3 Dc into 5th ch from hk. (Turn work so current Little Block is in line with previous Little Block.) * Sl St into Ch loop of previous Little Block.  Ch 3. Work 3 Dc into same Ch loop.  Sl St into Ch loop of the next  Little Block of previous row.  Ch 3. Work 3 Dc into same Ch loop. Repeat from * for all other Little Blocks.  {5 Little Blocks Total for this Row}
Row 6: Ch 5. Work 3 Dc into 5th ch from hk. (Turn work so current Little Block is in line with previous Little Block.) *Sl St into Ch loop of previous Little Block.  Ch 3. Work 3 Dc into same Ch loop.  Sl St into Ch loop of the next  Little Block of previous row.  Repeat from * for all other Little Blocks.  {6 Little Blocks Total for this Row}
Row 7: Turn work. Sl St across 3 Dc and into Ch Loop same Little Block. * Ch 3. Work 3 Dc into same Ch Loop. Sl St into Ch Loop of next Little Block of previous Row. Repeat for all other Little Blocks on this Row, ending with a Sl St into Ch Loop of last Little Block.  {5 Little Blocks Total for this Row}
Row 8: Turn work. Sl St across 3 Dc and into Ch Loop same Little Block. * Ch 3. Work 3 Dc into same Ch Loop. Sl St into Ch Loop of next Little Block of previous Row. Repeat for all other Little Blocks on this Row, ending with a Sl St into Ch Loop of last Little Block.  {4 Little Blocks Total for this Row}
Row 9: Turn work. Sl St across 3 Dc and into Ch Loop same Little Block. * Ch 3. Work 3 Dc into same Ch Loop. Sl St into Ch Loop of next Little Block of previous Row. Repeat for all other Little Blocks on this Row, ending with a Sl St into Ch Loop of last Little Block.  {3 Little Blocks Total for this Row}
Row 10: Turn work. Sl St across 3 Dc and into Ch Loop same Little Block. * Ch 3. Work 3 Dc into same Ch Loop. Sl St into Ch Loop of next Little Block of previous Row. Repeat for all other Little Blocks on this Row, ending with a Sl St into Ch Loop of last Little Block.  {2 Little Blocks Total for this Row}
Row 11: Turn work. Sl St across 3 Dc and into Ch Loop same Little Block. * Ch 3. Work 3 Dc into same Ch Loop. Sl St into Ch Loop of next Little Block of previous Row. Repeat for all other Little Blocks on this Row, ending with a Sl St into Ch Loop of last Little Block.  {1 Little Blocks Total for this Row}. End off, weave threads.

This can be expanded to any size you want, simply continue expanding the pattern past Row 6.  For each Row you add, there will be that many Little Blocks.  
When you have achieved the Length and Height you want (measure the two straight sides), then start decreasing the number of Little Blocks for each row, as illustrated in  Row 7.

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