I don't think it would be appropriate to open a "shrine" thread for a poster who is very much "alive" and active. With the poster's agreement you could perhaps open a Q&A thread.
A lot depends on the reason why you want to do it.
Just my opinion, I hope a mod will comment later.
A shrine doesn't have to be about an inactive poster though
I just wanted to open a thread which gathered all of heya's best quotes. Not sure if you would call that a shrine or something else. Would something like that need approval from the poster, because I'm not sure what kind of response I would get if I asked...