This is a sampling of the various blank journals with different structures and bindings that I have made over the years (many times I will test a new structure or binding by making a blank journal first).

Japanese Stab Bound journal
size: 11.25 x 9.5"
materials: Davey board, Cialux bookcloth, Rives lightweight paper, Lokta paper, Irish linen floss

Leather Spine with Sewn-Binding journals (twisted cross and alternating long stitch)
size: 5.75 x 8.75"
materials: Davey board, Italian paper, Southworth linen paper, leather, Irish linen floss

Piano Hinge with Wood Skewers journal
size: 4.5 x 6.25"
materials: Lokta paper, Kozo paper, Southworth linen paper, wood skewers