let me first apologize for these pictures. they are pretty crummy.
but here is a diaper bag i was commissioned to make for my friend. i have playing with the dimensions and such, and this one is my favorite to date.
i designed the pockets with baby stuff in mind; diapers, bottles, lotion, etc. the outside pocket is for the essentials; lipgloss (for mommy), keys, cell phone, ipod. i have found these are the items i am often reaching for with one hand while holding baby, or driving. so they need to be super easy to reach and grab.
and i had to add a bit of pretty to the outside as well. i did so in the form of my handmade flowers, done in beige silk, with a dab of adornment in the centers. lovely. even though she had a boy my philosophy on diaper bags is this: it is YOUR accessory. you have to carry it, and it should match your personality. have fun with it. you will be attached to this accessory wherever you go!