Abbreviations:
P = plain weave
U = under
O = over
Warp loom as follows:
Layers 1 and 2: use color 1 (sample shows Caron Simply Soft “Lavender Blue”)
At corner 3 change to color 2 (sample shows Caron Simply Soft “Soft Pink”); warp Layer 3, finishing at corner 2. Wrap yarn five times around loom, cut, thread needle.
Instructions:
R1 and R16: P
Even Rows: P2, (U3, O1) x 6, U3 , P2
Odd Rows: P4, (U3, O1) x 5, U3, P4
3-and-1
back view
UPDATE 11-11-16
This pattern works well on the 2″, 4″, and 6″ squares and rectangles.
3-and-1 on 6″ square loom
3-and-1 on 4″ x 6″ rectangular loom
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10 Aug 2018 UPDATE: the pattern below was originally posted as “3-and-1,” but did not go with the photo. It’s also a legitimate pattern.
Rows 1 and 16: P
Rows 2-15: U-1, O-3 seven times; end with P-3
3-and-1 reverse