If you can't clean up the painted edge, you could always add a 1x3 piece of wood as molding. You can even carry it up to the ceiling to frame that wallpaper. I don't see that paint color in the wallpaper, or maybe it's a lighter version of the flower centers. Maybe stencil on a design using the darker color, or another color from the wallpaper to help tie it together. Then narrow floating shelves or vertical frames or something in the painted areas it you feel you need it. Maybe turn the bed around so the wallpaper is the headboard.

I love the seagrass wallpaper in first pic, so classy, you can pick up colour in the bedding and accessories, love the teal and orange

Hello Sir, I do not understand- what do you mean by "changing the wall Designs." For coloring/wall papers/textured painting it is better to have finished wall. For wall cladding/tiling it is OK to have a non finished wall as well as they require a rough surface. For changing the tiles, its quite a messy, and wasteful expense. Rather, you can give the tiles of your choice to builder to install on the first go itself. Some builders don't allow such requests but others would happily do so. Some others may even offer a discount for not using their tiles. Same thing with paint as well you can give your colors to them to paint if you are not happy with white. Thanks, Nitin CORNERSTONE DESIGNS Bangalore.

You can get a custom wall art done , glass with bronze, glass painting, that wall should be a center of attraction, anyone walks. I have done this for a site, it works wonders, guest appreciate a unique feature. this can be done as DIY project on weekend also. these are some some real world executed ideas. cheers mate.