We've started stocking these ice cube trays as most standard ones make cubes slightly too large to fit into the mouth of our mini kegs.
It's great to be able to add some ice to your gin & tonic, nitro coffee, homemade sodas etc and if you put ice in one of our black insulated mini kegs or growlers they will stay ice cold for at least 12 hours in full sunshine on a 40 deg day.
Having ice in the keg is also great if you want to give a cocktail a shake to quickly infuse it with nitrogen as it mixes it together and "beats" the gas into the liquid.