Concept: “beautiful woman but her head is a hideously huge swollen staring eye, wearing only a spiked armor”
Content: "More than anything, it wants to: Mate, birthing a wondrous new horror.
Writing: The Monster Approacheth meets “hold my beer”
Art/design: Unfunctional fashion. Functional design.
Usability: Scarily effective. 

Concept: “Enter as three and be free”
Content: A Norse myth puzzle crawl.
Writing: Encounters that heavily reference mythological events and figures.
Art/design: A map and protective ward.
Usability: More likely to confound the enemies of the Æsir.

Concept: “23 new eyeballs. You know, in case you lose one and need a replacement.”
Content: Ocular alternatives with a wide array of special features
Writing: Short and concise descriptions with grim character
Art/design: Original illustrations of each eyeball in easy-to-use layouts and stylish designs
Usability: A clever, thematic alternative to generic rings, amulets, etc.

Concept: “The mages glance to a paradise that was never made for the mortals of this world, so they have to adapt for it.”
Content: Lore and stats for eye mages and the bizarre wares they peddle
Writing: Overtones of alien and body horror
Art/design: Tons of twisted eyeball-based and beholder-inspired artwork
Usability: For PCs, potentially beneficial friends and potentially dangerous enemies

Concept: “Grave robber, beware! They feast on fresh human bones that they suck out of their live victims.”
Content: A Tenome (Tergol?) and its lair.
Writing: Simple, but with visual texture. (Specifically, eye texture)
Art/design: A restrained psychedelic palette. Befitting an oracular creature with visions of the past and the future in the palms of its hands.
Usability: An outline of a scenario, with some details left to fill.