Closest I can think of is the Varisian Tattoo feat from the Inner Sea World Guide-289, and the associated Tattooed Sorcerer archetype from Inner Sea Magic-40, which give a spell like ability from a tattoo. The spell-scar magus arcana gives what are basically scrolls inked into your skin. Blood of the Moon-21.
Arcane Anthology has a few paragraphs on what spellbooks look like, but they're still books (more or less). Same for Ultimate Magic.
A couple of archetypes give a wizard a familiar for spells (like a witch, instead of a spellbook), specifically the Familiar Adapt from theFamiliar Folio-8, and the Spirit Whisperer from the Advaced Class Guide-133.
There are several witch archetypes that alter her familiar, the closest to what you talking about is the Bonded Witch, limited to half-elves storing spells in a bonded item instead of a familiar. Advanced Race Guide-43.