What is the best five-dollar investment for a kids' room transformation that lasts years?

Glow-in-the-dark star stickers are the ultimate ROI in kids’ room decor. A five-dollar pack turned into months of bedtime conversations about constellations, and they’re still on the ceiling two years later. The glow lasts a solid hour after the lights go out, and the adhesive doesn’t take paint off when you eventually peel them down.