You don't have to have thousands of dollars to decorate a child's room. Walmart, the Dollar General, Family Dollar and Dollar Tree are really all you need.
Wall Decals are great because you can peel and replace them so very easy. I also shopped on Facebook market and found a projector for $15 dollars. With one of these you can be the best artist in the world. Just tear a page out of a magazine or newspaper that fits your design idea and with a pencil trace it on the wall. When your idea comes to life in pencil on the wall, you can re trace with a marker pen, then paint, or just paint.
You can find all kinds of bargains at thrift stores! You can find cheap acrylic paint and acrylic paint pens on amazon and turn an old lamp and into a New Found Treasure. Lamp Shades are easily changed with fabric paint.
Add wicker baskets to shelves for storage without breaking the purse.