I'm not sure everything that has been posted here (I got through about half, and love EVERYTHING posted so far).
I like to keep a few journal type books at a time, and use them for different things. My favorite one is my poetry one. I will not allow myself to write much more than poetry (though I loosely define poetry) in it. Some sketches that are relevant are allowed. The biggest part of the poetry journal is that is should fit in an average sized purse, so I can carry it everywhere. I try to write some type of poetry every day, even if it is just an interesting sentence that flows off my tongue well. The best part about it being small, is that I can't really write stories in it anyway, and it doesn't intimidate me as much. My poetry journal is my most private, as it is almost like a diary...I don't censor anything.
Another one, is a creative writing one. This one is used less often, and more often when I'm traveling. It has more sketches and stories and character ideas. When I see someone at a store, I'll jot down a character idea for them. I also write down interesting conversations I overhear. This kind of journal (for me) also tends to get a lot of junk in it, as it is a normal school type spiral notebook or a composition book. My friends will write in it or I'll just draw shapes when I'm bored. I wouldn't have it any other way.
Then I have my *sigh* "normal" journal...like a diary. I rarely ever use it unless I want to document more ordinary things. BORING.
One that I have tried in the past is one where I only use journal "starters" (like what is something you remember from childhood, or what makes you mad) and glue/tape in things I find. Here are some pictures of it.
The front was blank for awhile and it bugged me. Then I purchased a pair of "Personal Identity" jeans and used the tag for the front. I felt it perfectly explained a journal.

Here's the back.

I put a lot of quotes I like. Also, here's a list of things I was afraid of at the time (some I still am)

Something I got at a parade.
http://www.craftster.org/pictures/showphoto.php?photo=302855&ppuser=150615Sorry that I'm being a space-hog!

I've had problems with glued pages sticking together...any ideas?