There have been way too many times where I have missed my mail because I am either in my studio or otherwise engaged when I am home.
I have made something so simple with Photoshop Elements (any editing software would do fine) that anyone can do.
I added the "Please Knock Loudly" because I have noticed mail carriers simply do not knock loud enough for me to hear, either that or they stay for a mere two seconds waiting and then they leave, not giving me enough time to get to the door and answer.
I printed it on a 8x5.5" cardstock. I then laminated it with clear packing tape since I do not have a laminating machine (I improvised), and taped it to my door.
Here's to hoping I no longer miss my packages when I am home.