Hallway / playroom

I'm going to set up a table for kids crafts and homework in here, so I wanted to use some fun wallpaper. I didn't have exactly what I need, so I will need to camouflage an awkward transition between two patterns. I am also struggling with the puzzle of how to get the wire from the room under the stairs to travel across the room discreetly so it can go up to the third floor where the battery pack will be. Suggestions welcome.