I don't know about you, but I've never spent a second worrying about dust getting in the ear phone jack of my iPhone. However, in Japan, sketches and prototypes of a series of cat shaped ear phone jack protection accessories became a Twitter phenomenon, and now the productized cuties are available for sale.
The original @ Nekomura_otako twitter images
Story of how Pink Company discovers designs and makes the product
and now the six designs for 500yen each ($6.40)
smiling dangling kitten
the artist also design Vocaloid Rin and Len iPhone covers