If you're having friends over for coffee, sugar cubes are a more attractive option for offering sweetening. Sure, you can buy them at the supermarket, but they're fairly easy to make yourself.
Culinary weblog Serious Eats explains that you simply combine sugar and water until the texture is even and the sugar seems just slightly moistened. Press the sugar/water mixture into a mould firmly and and let the sugar harden in the mould overnight. Ice cube trays can work, but you'll probably want to cut up the cubes when they come out with larger sized cubes.
To experiment with flavours use vanilla extract, rosewater or other aromatics to give your drinks just the right taste.
DIY Sugar Cubes [Serious Eats]