I remember featuring this before. The Free Verse Reveries Duvet Cover comes with coloured pens so you can personalize your duvet cover!
If an entire duvet seems a bit much, you can go for the Free Verse Reveries Pillowcase Kit. You've got two sides to decorate and fill with your literary thoughts.
Ok, this seems a little literal, but this vintage-looking pillow called
Relaxation on My Mindreally appeals to me!