So I made one.
The cover is salvaged from an old scientific publication that I have lying around
There are sections for blog ideas, meal ideas, shopping lists, book and movie suggestions, finances (I have a compulsive habit of checking my balances in all my accounts and writing them down at least once per week), and random thoughts.
I drew up the designs in Illustrator (the pages are 4.25 by 5.5 inches, which gets you four pages to a standard sized piece of paper), cut everything out and and then did a simple binding using a 1/8" hole punch and some thick thread. The dividers were spray glued onto some thin cardboard to give them more stability. I could probably have done a better job but I'm too impatient once I get an idea for something. This will work nicely while I think about improvements.