One interesting technique I have seen with fiber is running it along/behind baseboards in old houses. Since it is very small (and you can get even smaller single mode fiber) it can in some cases run along side. Some people remove the baseboard and put it behind it. It creates some routing issues, but might also solve some.
Yea, that can be an issue, although for shorter runs it is surprising how much loss you can have and still work fantastic. There are some very cool bend insensitive multimode fibers that would work well in that case.
I saw a video where someone was doing this and they used little plastic bend guides that were painted trim color.. not perfect but also not as noticeable as I would have thought.
