In the regalia of tinsel and glistening balls and colored lights that characterize the holiday season, greeting cards still claim a spot of the limelight. Over and above the glare that commercialism has given to Christmas, still the person with a hint of the sentimental in her nature has a yen to scatter random samples of the season's best wishes- to revert back to the warm mutual friendliness of "Merry Christmas to Aunt Susie from your only niece- and a Happy New Year too." Christmas just isn't Christmas unless part of the thrill of the season is shared among friends.