I vote not legit. Fr. Tanqueray had great commentary on this type of occurence. He said when evaluating phenomena that the Holy Spirit is never crass, crude or immodest. These occurences are never reduced to the common. It's a foregone conclusion that nothing Divine ever appears on a rock, a piece of toast, a tree trunk or mold.
I feel bad for these people. The Church is in such a desperate state. Many need to feel that divine connection.