In Cafe Fantasia in the DLH, you could buy both the glowing 'ice'cubes (they are plastic) and also glowing Captain Hook and Tinkerbell figures which fix to the side of the glass. So you could effectively make any cocktail a glowing drink, we got them for our children's alcohol-free cocktails. Afraid I don't know if you can do this in SL as well though. I had a blue glowtini and it was delicious.