if you're planning on decorating kawaii (cute, usually like those japanese cartoon things and like bright colors), paint the walls something bright that will pop out, like pink, blue, green, whatever, just make sure it isnt faded/pastel. then, use that color for the wall and make a color scheme. (like if you colored the wall blue, use colors like white, different shades of blue, yellow. you can find color schemes online if you can't think of any colors that go well together. then put up posters/pics of cute japanese characters, put some flowers in the room, like cute girly things. i also suggest a mushroom chair with tons of pillows on the bed & chair.
traditional japanese is another style. it uses dark wood (so get dark wood furniture) and its more contemporary than the other style. for the wall color, you can pretty much pick anything except for like HOT PINK. lol. so it has to be something rich and contemporary for the walls. then add things associated with nature. like a little vase with bamboo or other plants, maybe a bonsai tree. i also suggest those small fountains that have rocks, but if you cant get that a vase with rocks is nice too. add some pictures with japanese writing/people.
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