well- looking at your shot, and trying to work out the print size by the joins in the wallpaper, I'd put that at around an A2 print. I've certainly had quite a few pictures at that size or over - at the moment I'm sitting in my office with a canvas print of this in front of me...
Still Life with Wine and Walnuts by
The Big Yin, on Flickr
think it's around 48" across... no pictures of it on the wall, my office is far too much of a mess for that.
I've also sold a few pictures which have been turned into "murals" - i.e. printed on "wallpaper" and used to cover "feature walls"... Usually Landscapes/Sculpture stuff I'm sure some of the regulars on here would be pleased to hear (as some of my pictures do have a bit of a dark side to them...)
Personally I think we should encourage people to print their work far more - as I sit in my Office at the moment, I have something like 33 pictures on the wall - 25 of 'em are framed 10x8's , a couple of "big ones", 4 panoramas and the rest are 16x10's... God only knows how many I'd have if I was shooting on a regular basis at the moment - probably only 5-6 more, as I'm running out of wall-space...