Kamihikokimmd -

Attaching the plane to a character's hand bone so it moves naturally before being "thrown."

The primary file-hosting site for MMD assets. Searching for the Japanese tag 紙飛行機 (Kamihikoki) will yield various styles, from simple white folds to complex, patterned designs. kamihikokimmd

This is the "image board" version of Niconico Douga, where creators post previews of their models along with download links and passwords. Attaching the plane to a character's hand bone