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Many parents or guardians don't mind if you just rearrange the furniture in your room, but anything more than that and they'd most likely raise an eyebrow (or get angry). Ask them for permission to redecorate your room before you get started on it; tell them what you want to do with your room and ask them if that would be something that could be done. Asking your parents about making a change can be a big help when it comes to getting new room décor!  If your parents say no, ask them why, rather than getting upset or angry. There are many reasons they might not want you to change your room, from money to concerns about what you want to do. This can make it easier to figure out how to compromise with them. Oftentimes, it's easier to convince your parents to allow things like small and easily portable furniture, rather than large furniture or repainting the room. Small, portable furniture doesn't require a lot of effort on behalf of your parents to get into the room and set up, and is usually less expensive. A large amount of your room's style will be based off of your version of "cute" - so think about it. What do you think is cute? Remember, it's your room, not anybody else's, and you're free to decorate it the way you want to. Considering your interests and your definition of "cute" is important to show off your own style.  While you're welcome to think that anything is cute, "dark" themes (such as the color black or maroon, "scene" or "emo" styles, typically dark symbols such as a skull and crossbones, etc.) are usually not considered cute. Cuteness is typically associated with innocence and cheerfulness, not a cynical or jaded outlook on life. Things like lighter shades of colors (such as blue, pink, yellow, or purple) or pastel colors, stuffed animals, fluffy things (like fluffy pillows, rugs, blankets, etc.), fake flowers, and anything that's often considered a toned-down version of "girly girl" themes are often considered cute. There are many themes out there that you could base your room off of, from themes about things you're interested in, to cultural themes, to themes of characters or certain media. Decorating your room around that theme could give you a good starting point. Don't go overboard - it's one thing to have a few of your sports trophies up on a shelf and posters on the walls, but it's another to have your room be completely dominated by sports to the point where there's no variation at all. Mix it up a bit. There are many people who have ideas for ways that you could change up your bedroom. Some people are inspired by social media to create certain styles of rooms (such as "Tumblr rooms"), while others are inspired to arrange their room a certain way or to make a certain craft for it. Running a Google search for "room decoration ideas" could be a great way of finding inspiration. Once you've decided what kind of look you want your room to have, create a drawing of your room and how you want it to be set up. Doing this will allow you to visualize your room's future appearance more easily and know where you want things to go. Chances are, you're planning to buy new things in order to redecorate your room. However, not everyone has the money to buy absolutely everything they want, and you may fall into that category. It's best to set up a maximum amount of money you'll spend on redecorating your room, and designate amounts that you're willing to spend on every aspect of decorating. It might be disappointing to not have a lot of money to spend, but it's better than spending what you don't have. Budget your time, too - unless you're on a school vacation, you're most likely not going to be able to devote all of your waking hours to decorating your room (and neither can your parents or guardians). In addition, if you plan on decorating walls, keep in mind that it can take several hours for paint or wallpaper paste to dry, and even longer to get the smell of paint out of the room. Redecorating a room isn't a task that can often be completed in under an hour. If you're just the kind of person who prefers to make things rather than buy things, consider trying out do-it-yourself projects. There are guides everywhere online, even here on wikiHow, to make crafty projects that can make your room a lot cuter. DIY projects can also show anyone who enters your room that you're a fan of crafting things on your own, rather than buying them. DIYs can be expensive, depending on the materials you need, and are often time-consuming. In some cases, it may be better to buy something pre-made than to make it yourself, since some projects can become pricey and take a lot of time to complete. If you can't decorate your room in a certain way, don't panic - there are ways to make your room look better, even if it's not in the way you originally planned. It's possible to find alternatives to what you were originally planning to do. In fact, you may even end up liking the new idea better than what you wanted to do before that! Get creative and see what you can come up with - you can look online for ideas or work with friends or family to figure out some new ways to brighten up your room.  If you can't paint your walls a different color, change the bedspread to match it so it won't look so bad. You could also consider placing decorations that cover a fair amount of the wall, such as a bulletin board or posters. Change up your existing furniture. Find stickers or paints and decorate your desk, throw a blanket over your desk chair, and decorate and hang up your old picture frames. If you're the crafty type, you can find ways to repurpose what you already have with DIY, which can be quite cheap if you have all the supplies on hand.

Summary:
Ask your parent or guardian for permission. Consider your interests and what you think is cute. Decide if you want to use a theme. Search online for inspiration. Create a drawing of what you want your room to look like. Think about the budget. Try your hand at DIYs. Search for décor alternatives.