Hi! I am a photographer who happens to be a glass blower, I started making ice cubes made of ice for food and stock photography. nothing comes close to pyrex (borosilicate) glass in terms of clearity and strength. Sorry, I cant get the pictures to show here but take a look: http://orrza1.googlepages.com/home (you can click on the pic to see it bigger) I could try making whatever size or shape you want, round onse, letters, hearts... paypal is accepted. Peace, Orr.