1. Blend butter or margarine, cream cheese and Worcestershire sauce until smooth in a medium-size bowl; spoon half into a second bowl.
2. Halve eggs; remove yolks; press through a sieve and blend into mixture in one bowl. Cover bowl and set aside with whites for decorating canapes.
3. Trim crusts from bread; cut 12 rounds out with 1 1/2-inch cutter from 3 slices; cut 12 diamond shapes from remaining slices. Spread each with plain cheese mixture. Decorate, garnish and freeze.