Estrella Damm have been doing this for a while, usually themed limited editions, like this one:
[img:3uxie1mp]http://www.anuncios.es/files/133170.jpg[/img:3uxie1mp]
Taste apart (given there's not much to ruin), I always thought it was a great idea, in a country where drinking outside is pratically a national sport and broken glass during festival time is a real threat to those wearing flip-flops and sandals.