Errr you can not be serious (quote J McEnroe)
Can you match those tiles, do you think? If you can its possible to gradually build up the hole and tile over.
If thats a no go, how about a piece of white acrylic sheet which would overlap the hole edges? Not the best maybe but a quick, probably acceptable fix.
John
It difficult to tell from that angle but how I would go about it. I would temporary remove the fan build a small wooden frame recessed in the hole attached to the walls of the hole. a piece of plaster board cut to fill the gap and carefully screwed into the wooden frame with plaster board screws with a hole cut in for the fan. Then tile over plasterboard with tiles to match the current ones.
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