You already have an "accent wall" in that the striking colors you have used, already make quite a statement. I don't think I would try to highlight any specific wall in either of those two rooms. I applaud your courage in using those colors and I like them a lot! I think you should get your new furniture in there before you do anything else to the walls. Once the furniture is in place and you have re-evaluated all of the accents in the rooms, you can see if you need stencils anywhere.

After posting here yesterday I googled wallpaper stencil and saw the most gorgeous patterns and ideas. I looked at as many sites as possible and loved all the amazing things that can be done with paint. The site that seemed the most reasonable was www.stencilease.com. They had a lot of the same patterns as some others did, but at much better prices. I think that you get the same end result only you get to customize colors, glazes, combos etc... and it can really be a personalized look. The only downside may be I have no idea how I can narrow down the pattern, much less the colors with so many choices. I saw so many that would look so good.... happy sigh.... btw - for some reason, GW has not let me post links in over a week. I see others can, so wonder what has changed for me.

IMO the blue paint is the wrong color if it matched the tiles then I think the wall paper would work. Maybe just a apint that matches the tile and then the wall paper.

I'm confused. Why do you need a rod pocket if your are using hooks and rings? I would get a linen in a color of the background. As much as I like orange, I think it will upstage the wall paper. Do you have to mount it on the outside, because the interior screen takes up the depth? Take a look on Vermont Country Store. Many of my rooms have curtains from them. I like these Sheers in Natural.