I saw this post from mypapercrane today and had to share. Cute idea – I wouldn't mind doing this to the art books that need to be protected from my sister who borrows them and doesn't return them for months.
And here is an older post I saved from apartment therapy. Another whimsical idea which looks quite easy to replicate on your own (the website that sells these is all in japanese so I have no clue how to buy them).
specficromantic 