what color are the walls? while they are out, mod the walls. before they get back, try and put some hard paper that is the same color as your walls over the part you modded. Be a ninja! lol
Do origami to calm yourself when something doesn't make sense or fit! haha, if all else fails get the paper you folded and burn it for no apparent reason.
-.- my dad just painted the wall, i am not hacking it up.
I run cables for a living and sometimes it can be tricky others easy but it almost always can be run without being seen much.
What floor are you on and what floor is the router on? Are you on opposite ends of the house? can you run it through the attic and down a wall or through a basement with unfinished ceilings then back up into your room? The last possibility is running it out the wall and around the house tucking it under the siding or stapled to the underside of the roof overhang. Look around at homes that have been around a while and you will see that phone cables have been run this way after the house was built because the owner wanted a new line but didn't want to tear up the drywall in order to hide the wire inside the walls.
Hope this helps, and if you have any questions just ask.
Favorite Quote: " It seemed like a good idea at the time..." your neighbor.