Alternating Diagonals | Reversible pattern looks exactly the same on both sides, created only with simple knit and purl stitches.

Knitted in a multiple of 10 stitches and 24-row repeat.
Rows 1 - 2: * K5, p5; repeat from * to end.
Rows 3 - 4: * K5, p5; repeat from * to end
Rows 5 - 6: * K4, p1, k1, p4; repeat from * to end.
Rows 7 - 8: * K3, p2, k2, p3; repeat from * to end.
Rows 9 - 10: * K2, p3, k3, p2; repeat from * to end.
Rows 11 - 12: * K1, p4, k4, p1; repeat from * to end.
Rows 13 - 14: * P5, k5; repeat from * to end.
Rows 15 - 16: * P5, k5; repeat from * to end.
Rows 17 - 18: * P4, k1, p1, k4; repeat from * to end.
Rows 19 - 20: * P3, k2, p2, k3; repeat from * to end.
Rows 21 - 22: * P2, k3, p3, k2; repeat from * to end.
Rows 23 - 24: * P1, k4, p4, k1; repeat from * to end.

Knitting abbreviations:
K: Knit | P: Purl