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I figured it out myself, here's the code:

public class Input{
    private static boolean escDownOnLast;
    private static boolean escToggled;
    
    public static boolean rainbowOn(){
        if(Keyboard.isKeyDown(Keyboard.KEY_R)){
            escDownOnLast = true;
        }else if(!Keyboard.isKeyDown(Keyboard.KEY_R) && escDownOnLast && !escToggled){
            escDownOnLast = false;
            escToggled = true;
            return escToggled;
        }else if(!Keyboard.isKeyDown(Keyboard.KEY_R) && escDownOnLast && escToggled){
            escDownOnLast = false;
            escToggled = false;
            return escToggled;
        }
        return escToggled;
    }
}