The colors you choose for kids bedding and curtains will play an important feature in the whole "feel" of the room. You may decide to go with bright and vivid colors (as there are many options available when choosing bedding and curtains for kids, or you may want to keep everything in a calm pastel tones, that will help encourage bed time. No matter which colors you choose, make sure that your child is part of the decision making process. This will help ward off any future battles with your child when the room is complete.
You may also decide to choose kids bedding and curtains that have a theme rather than a solid color. Choose a pattern that will help reinforce bedtime, and not keep the kids up all night. There are plenty of options to choose from, you can find bedding and curtains for kids in nearly every print imaginable. Try choosing a theme that compliments the rest of the room's décor and also your child's personality and hobbies. As long as your child participates, you will find that you can create the perfect room for your child, and have a wonderful and positive time redecorating with your child.