According to the Roman addition of the Archierotikon, Antimensions are now blessed outside of the Divine Liturgy in a seperate service. Chrism is used. Antimensions do not have to be Consecrated on Holy Thursday. If so, they are consecrated before the Vigil Liturgy. September 1st seems to be the appropriate day to consecrate them. Metropolitan Stefan Soroka, of philadelphia, issued a colored antimension depicting a central icon of 'The extreme Humility' flanked by St. John Chyrsostom and St Basil the Great. on top is the distribution of the Eucharist to Saints Peter and Paul. The Antimension is also in Ukrainian and English.