Fr. Nektarios Serfes maintains some beautiful pages on his web site (http://www.serfes.org/royal/index.htm) honoring the holy martyrs of the Russian Royal Family. Here is one especially dedicated to the martyred children of the Tsar: http://www.serfes.org/royal/child-martyrs.htm
A second page containing poetry related to Royal Martyr Grand Duchess Olga at the time of martyrdom, is found here: http://www.serfes.org/royal/83rdanniversary.htm. A miracle of the Child Martyr Grand Duchess Maria is found here: http://www.serfes.org/royal/miracleofmaria.htm. Please take time to peruse the variety of pages on the holy martyred family on Fr. Nektarios' site.
Read some of the miracles done by the Sainted family of Tsar Martyr Nicholas: http://www.pravoslavie.ru/54877.html
Let us consider a prayer to the Royal martyrs, Tsar Nicholas, Tsarina Alexandra and the royal martyred children who have undergone the ultimate trial in this life and emerged triumphant:
O Holy Royal Martyrs Nicholas, Alexandra,
Alexis, Olga, Tatiana, Maria and Anastasia,
pray to God for us, that we, too,
when the hour of trial comes upon us,
remain faithful to our Lord Jesus Christ. Amen.