I'm trying to track down an answer to a question: can someone who is a "venerable"* or a "blessed"--but not a "saint"--be honored with an image in a church? Last night, I went looking through the General Instruction on the Roman Missal and Built of Living Stones, the document the U.S. bishops put together several years ago on church architecture, but didn't find the answer there; nor was an Internet search helpful.
Update: I may have found my answer...I read an article at the Catholic Encyclopedia about the distinction between beatification--declaring someone "blessed"--and "canonization," after which one it termed "saint." It made the point that once one is beatified, s/he can be venerated as a saint, but not universally; canonization makes the permission--or mandate--universal. Hence, depending on the locality--and perhaps with ecclesiastical approbation, I'm guessing a Blessed can have an image put on display for veneration; once canonized, no permission would be needed.
I'm not saying this is right; if anyone can shed light on it, I'd be grateful.
* I realize not everyone is familiar with the distinctions the Church makes about someone being "venerable," "blessed" or a "saint." This is not a subject I can address in detail, but here's a quick summary: the Church has a formal process for declaring someone a saint--i.e., "canonizing" a saint. It involves initially recognizing someone as a "servant of God," which is the very beginning step, after which "the cause" has begun.
Part of the process is to investigate fully the individual's life and writings, if any. The faithful are invited to ask the Servant of God to pray for various things, and then the Church waits to see if anyone can show a miracle happened as a result. Proof is demanded, and insofar as it involves a healing, medical experts are consulted. The idea being that if we ask the late Pope John Paul II to pray for a miracle, and God grants it, that is evidence of the late pope's sanctity and being in heaven--and thus, a saint. But the Church requires more than one round of that, hence the steps of being declared "venerable," then "blessed," and then "saint." The reason for it being deliberate is, of course, to try to get it right. I probably got some detail wrong in describing this--this is a very quick, "not ready for wikipedia" version of the process!