The following are images you might find useful for your celebration of the Solemnity of the Most Blessed Trinity (Year A). The Dogma of the Trinity states that God is the Triune God, existing as Three Persons but one being. While these Three Persons are one, they are truly distinct one from another. They are not three Gods but one God.
For more information about the Dogma of the Trinity please follow this link: http://www.newadvent.org/cathen/15047a.htm
To view and download their full size versions, please click on the images or the names of the artists/sources.
Trinity by Fr. Stephen, MSC
Trinity by Fr. Stephen, MSC
Holy Trinity by jdbradley
Father, Son, and Holy Spirit by Deacon Steve
The Holy Trinity by Greg Pestillo