Asking for wiring and cables to be concealed inside walls is always a risk. You run the risk of poor workmanship with wires that don't lie flat inside and the walls bulges out in an ugly track across the wall. Here're some home decor tips with creative ideas for uneven walls:
A fast and easy option would be to lay over the wall with a wall board. You'll lose only a few inches of space, and once the board's painted over, you'll get a smooth surface that matches the other walls in your interior.
A fun and funky option would be to commission a plaster artist to create a textural surface or even a wall mural. The basic material can be plaster or a more durable marble-resin finish. In one instance, the home owner's love of the sea inspired an artist to create a free form wave mural for the living room that evokes Spanish architect Gaudi's melting buildings as much as it does waves lapping the shore.
An important point to note is that both treatments, the wall board and the textual finish, are removable. This is important, as should you ever have to locate a fault in the electrical cabling, you can heck or remove the wall quickly. Textured finishes can be repaired and repainted, so no expensive remodeling will be needed.
If your room is covered with existing ceramic tiles, you should not try to paint over with ceramic paint since these paints are hobby craft paints and can be costly for such a large area. The result may also be unsatisfactory as you have never attempted such a DIY project.
One solution for unsightly tiled walls is to have the contractor cover the wall with gypsum board. You'll only lose a few inches in terms of depth. And you can then have the wall coats painted to match the other walls.
If you decide to keep the tiled wall, make it more prominent in your décor scheme by playing up the texture with furniture, So if you've got rust colored tiles, teak, rattan and ethnic accents would work well. Keep also to pale cheerful colors in the fabrics – banana yellow, aqua and cream are good choices. This will counter the dark wall and floor and keep the look light and airy.