This cool case from Quirky covers the back of your iPad mini with elastic webbing so you can stick stuff into it and keep your it all together.
$49.99 Web by Quirky
You can put your headphones in there, or pens or cards.
I don't think the charger would be able to fit, but maybe the cord could.
All the elastic is attached to a plastic rim that surrounds the iPad and snaps on and off.
It is kind of like those notebook bandoliers for an ipad, or the grid-it cases but less bulky.