You must like having a tidy car, lol! I do too but with 4 kids it never lasts longer than a day. But just like in April (the Car Diddy Bag), the pin that most people want me to write a tutorial for is something to control the car clutter.
Classic round nails combine short lengths with curved edges and tips. This shape is probably the least likely to break, making it ideal for people who don't want to stop and think before doing something with their hands.