Protestants have a mile-wide iconoclastic streak (can a central tenet be properly called a ‘streak’?), but I wonder if this is biblical. Observe Solomon’s temple:
“Inside the inner sanctuary he made two cherubim of olive wood each ten cubits high…Then he set the cherubim inside the inner room; and they stretched out the wings of the cherubim so that the wing of the one touched one wall, and the wing of the other cherub touched the other wall…Then he carved all the walls of the temple all around, both the inner and outer sanctuaries, with carved figures of cherubim, palm trees, and open flowers.” – I Kings 6:23,27, and 29
In Solomon’s temple, where Jehovah was worshiped, figures of those beings who stood before the face of Yahweh are placed in the Holy of Holies. And these aren’t just decorations to add ambiance: These babies are centrally placed and, well, huge.
As the priest (and the people in the outer sanctuary as well) worship before Jehovah, they are symbolically reminded (via the icons of cherubim) of the spiritual reality: They stand in the throne-room of the Lord of Hosts, with the Cherubim who stand before Him and minister continually.
If the saints who have gone before us now stand before the face of God (Hebrews 12), then would it not be appropriate to have their icons in the sanctuary with us as we worship Jehovah together?