It's very easy and looks amazing!
I made lots of different collages on my books. The good at this is, that each looks very unique, each has a special feeling, a speciality. It is sure, that a collagist's work is very interesting!
So, first of all, you have to buy some exercises books, for example like this:
Then collect some new/old magazines like Vogue or Bazaar:
Cut out the pictures you want to use for the collage:
Make the design of the collage (first the design, only AFTER it the use of glue):
The last step - glue the pictures together:
And..... it looks like this (for example). Great, isn't it?
If you don't want the backsite of the book blankly, you can choose a A/4 picture from a magazine and glue it on it:
I made a lot of these books, also for a present! They were very effective, so you could also try it! :))