Hex:

In edge color, slingshot CO 87 sts
setup row (WS): knit
1 (RS): sl1, k6, (centered double decrease (CDD), K11), CDD, k7 (75 sts)
2: knit
Switch to center color
1, 3, 5, 7, 9: sl 1, (k to 1 st before CDD, CDD), k to end
After each odd row: 1-63 sts, 3-51 sts, 5-39 sts, 7-27 sts, 9-15 sts
2, 4, 6, 8, 10: purl even
11: (CDD) across - 5 sts

cut yarn, weave through rem sts
weave in all ends

Rounded:
in edge color, slingshot CO 86 sts
setup row (WS): knit
1 (RS): sl1, (k12, k2tog), k1
2 (WS): sl1, (p2tog, k11), k1
change to center color
1: sl1, (k10, k2tog), k1
2: sl1, (p2tog, p9), p1
odd rows as for 1, even rows as for 2, with one fewer st between decreases ea row

when 5 sts rem, cut yarn, weave through rem sts
weave in all ends