The colour you put on your home's bedroom walls is very important, as a bright wall colour can be very energizing, which you usually want to avoid in a bedroom. A softer and darker colour can actually help to relax you, which is good in a bedroom. However, if you want to add even more visual interest in the bedroom, you might consider some painting techniques, beyond the colour itself. Note a few of those here so you know your bedroom walls don't wind up being boring and bland.
A linen technique involves a wide brush with dry bristles that you drag over the paint, left to right and then up to down. This leaves a type of scratch in the paint that resembles the weave of linen cloth. This can create a very clean and crisp look to the walls without being overwhelming or overpowering.
For a random pattern on the wall, paint it one solid colour. Then, roll up a rag like a sausage, not a ball, and use it to apply a darker or lighter colour of paint, rolling the rag over the wall with your palms. The texture of the rag will add a random pattern to the wall for depth and will help break up the solid colour.
Metals and patinas
While a dark colour can make a bedroom more relaxing, it can also get a bit muddy. Adding a metallic patina can break up the dark colour; to apply this, use a paint sponge and dip it gently into metallic paint. Dab the metallic paint over the painted wall; don't roll it on or try to cover the entire surface, but apply it in a random pattern. This will give the paint a metallic shine while still allowing the original colour to show through.
To give your walls a glazed look, start with a solid paint colour. Use a satin paint in a corresponding colour, mixed with a glaze paint mixture. Brush it on the wall in an X pattern. The glaze paint mixture breaks up the second paint colour so that it adds a darker wash over the surface of the paint.
To give the bedroom walls texture without changing the colour, use a flat paint trowel. Add paint to the face of the trowel and then press it down onto the wall. Then pull the trowel away from the wall without rubbing it up or down or to either side. Pulling the trowel away with wet paint under it gives the paint a beaded type of surface so the walls have texture.