In the process of designing a wedding invitation for a family member, I created 9 specs first. These are the 8 runner-ups in no particular order. I was testing different textures of papers, ribbons, colors, folds, and techniques throughout.
Spec#1: White paper, fold on 1/3 with maroon overlay over flap.

Spec #2: Black paper, fold on 1/3 with purple mulberry paper over flap, 2 jewels
Spec #2 inside: test of white and maroon paper with a vellum overlay.

Spec #3: Black paper,
gatefold, purple mulberry accent, and gold heart wax seal

Spec #4: Black paper, triangle
gatefold with punched holes and maroon ribbon tied through, inside has white overlay.

Spec #5: Black paper,
gatefold with punched holes and maroon sheer ribbon tied through.

Spec #6: White paper,
gatefold with purple mulberry accent, and black ribbon tied around entire invitation.

Spec #7: Black paper,
gatefold with maroon sheer/satin ribbon tied around entire invitation.

Spec #7 inside: natural fiber paper matted with maroon. (Tested paper successfully in printer!!)

Spec #8: Black paper, double-
gatefold (
gatefold with flaps) with maroon ribbon tied around entire invitation.

Spec #8 inside: white overlays on panels, minus the "flap" panels.
I will post the "winning" spec invitation very soon!!