Is there a way to add RGB to a PC if It doesn't already have RGB?

like the title says, i want to add RGB to a PC. i completely forgot about it while I was on a partpicker website. my PC looks stupidly plain and not a single component has RGB. so is there a way to add RGB without switching the components out? (like the gpu, ram etc.) and if it helps I'm from the Philippines and preferably as cheap as possible