3D

CSS envelope (open/close on click)

CSS Falling Autumn Leaves

CSS - 3d flip Business Card

CSS Flip Postcard

CSS Envelope (Open/Close on Hover)

CSS Foldable Birthday Card

CSS Playing Cube

3d Cube

CSS Door (Open/Close on Hover)

HTML & CSS Folded Birthday Card

CSS Christmas Card (Open/ Close)

CSS 2 door Wardrobe (open/ close on hover)

Book Page Flip (CSS/ jQuery)

CSS Music Box (play/ pause audio on click)

Check also:

CodeLife: Animations