Here's how we combined two kinds of clutter that we seemed to be accumulating at my house...a sticker book made from recycled junk mail envelopes. 

Some of those credit card offers and other mass mailings have envelopes with interesting windows.  We put them together to organize the kids stickers.

You'll need:  Several envelopes, card stock or cardboard for the cover and back cover, ribbon, a hole punch, decorative pieces for the cover.

Gather the envelopes together in a stack. It's fine if they are different sizes as long as you like how they will look as pages of a book.  Cut a front and back cover piece that is big enough to enclose all the envelopes. Punch two holes along one edge of the stack (you'll need to punch each envelope separately, but you can line up the hole punch with the first one you punched.)  String a ribbon through the holes and tie it in front to bind all the pages together.

Now you can organize your stickers (or other odds & ends, keepsakes, etc.) within the envelopes.  Decorate each envelope page as you like (we plan to decorate these with stickers, actually.)  Decorate the cover as you like as well.  We also used a brass brad on the cover and affixed a thin ribbon to the back cover to create a closure.

Let your kids get creative with their books...they might want to keep notes or drawings in here, keepsakes from a vacation, pictures they've clipped from magazines, favorite words, etc.

There are endless possibilities with handmade books.  Check out book arts web sites for more ideas.