I didn't realize it was a faux stone pattern. There is nothing you can do to hide the grid pattern I am afraid...However, as it is recessed in a niche, I am inspired by your windchime pattern to think of adding eyelet hooks on the top and bottom that align with the vertical grids and uplight them from behind...This idea but with less vertical rods, and then uplit to give an effect like the second picture...

You can work with your currant wall color or go more yellow - that is up to you. If you do decide to go more yellow. get some small inexpensive sample bottles at the paint store, paint some poster board and hang it on a wall for couple of days because getting the right buttery yellow can be hard. A soft yellow and lavender is pretty together but I also like the sea green. When you said a combo of modern and cottage - that made me think of beach cottages, which often have soft colors (including sea green) and unfussy, calm interiors. You can put a large painting up if you have the wall space for it. Many bedrooms have tall chest, dresser mirror, tall headboard and big TV, all which take up wall space. If you can hang the painting without it being crowded by any of the things I mentioned, it should look very nice. If you wish to do a curtain fabric treatment to a wall and you have the vision of what you want - then go for it. I had a friend who did that in collage - only problem was the yards and yards of fabric needed got rather expensive. So, I would start with finding bedding you love. Simple white is good, and not too expensive. However, you might find something else light that you love, or a quilt or throw for the bottom of the bed and the colors and shades might lead you in a different direction for wall color or accents. So bedding first, then curtains, then see how your wall color is and then add accents and art - although your painting can also be an inspiration for colors.

I personally would like to see you start your art collection. It may take a while but you will get there. And the hunt is tons of fun. Do not worry, about who made it, only that it is original or a signed numbered print of maybe 200 and that you love it. sources, etsy and Saatchiart. oodles and it changes all the time. often $100 or less. both under $60 etsy a few of the myriad ways to make your own Butterflies or some other small collectible natural or otherwise One large on subject matter, then small ones regarding that topic framed important things in your life magazines, album covers important newsprint that means something to you Bandanas, or how about the decorations off your favorite clothes before they go out. plates, or mugs, judgin by your couch, these are not it, but there are some really cool modern ones too large copies of musical scores. hope it helps

house is good in white. ensure you choose off white colour such as cotton woll and not brilliant white whike repainting. Gate in black. boundary wall in mud colour. overall it would look like a spanish villa. only thing missing is a big olive tree or a palm tree