There is an app Notin which was amongst the top apps of the year as per XDA and by a coincidence had downloaded today and works well
With notin, never forget the little things anymore. It's an easy way to save notes or reminders as a notification.
notin helps you in reminding things you need to do, random numbers you do not want to save in your contacts and many more through the help of Notifications. The reminder doesn't pop-up or rings, it just sits there and still does it's job most efficiently.
