K. Markiewicz executed the interior decorations of Holy Trinity in 1914 by and the mural paintings on the vaults were completed in 1926. The fine stained glass windows were selected in 1940 and installed in 1955. Most were installed by a well-known Polish artist, Irena Lorentowicz. A figure of Our Lady Queen of Emigrants by Professor Wiktor Zin was brought to the church and blessed by Cardinal Joseph Bernardin in 1990. In 1992, an urn filled with soil from Kharkiv, Katyn and Mednoye in the former Soviet Union. Each of these sites contained mass graves of Poles murdered during World War II. The congregation installed memorial plaques in the narthex in 1993 and 1994 to honor Casimir Sztuczko, CSC, the longtime pastor of Holy Trinity who oversaw the building of the current church, and to commemorate the 50th anniversary of the Battle of Monte Cassino, respectively. The "Millennium Doors", by artist Jerzy Kenar, began welcoming visitors into the sanctuary in 2000. In honor of the 100th anniversary of the construction of the current church, the congregation began a renovation campaign in 2005. Work included installing new copper cupolas the two church towers, new granite tile in the presbytery, and the painting and refurbishing the interior. The area above the choir received a new mural depicting St. Cecilia in the company of an angelic choir. Other new depictions include St. Faustina, Cardinala Stefan Wyszynski and August Hlond and Pope John Paul II were added to reflect Saintly cults popular among today's Polish community. The parish obtained relics of St. Gianna Beretta Molla, Karolina Kózka and Padre Pio for adoration by parishioners.