If you wish, you can keep his bedding the same for a while, to give him the comforting feeling of some sort of continuity in the transition. Or you can have brand new custom bedding designed to match the theme of his big boy bed. Which option is best depends really on the child.
Why did people sleep on metal beds in the old West? The biggest reason people would sleep on them is that they were the easiest available material for people of that era and part of the world. Many people of this area were metalworkers and they made their beds by hand.
If you are going for a sophisticated look in your private retreat, you might consider jewel tones, but lighter variations can be the perfect touch. With a fresh coat of paint, you can transform the bedroom, but when you start incorporating other sophisticated touches, like Roman shades and textured bedding ensembles, ornate mirrors or deep, rich wood and leather furnishings, your bedroom's ambience can be transformed to that of a high-class, luxury hotel suite. In fact, there are many home designers that consider luxury hotel suites as their inspiration, when looking for sophisticated interior design.
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