As a fan of bows, I recommend you to have a look at Calzedonia! The leg wear and beachwear specialist offers a series of socks, tights with ribbons of all colors: blue, black, gray and glitter. For my part, I bought tights with black ribbon, and 3 pairs of socks: blue, red and gray glitter! They are the perfect match with some trendy sneakers and a dress or even with a simple slim trouser that will let the knots out.
You can buy them on Calzedonia website at a price of around 10USD/ pair of socks depending on the country you are. They deliver in most of the country in Asia including Hong Kong but not yet Singapore so you will have to find a friend to bring you back a pair from Europe!