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    rgba also works very nicely in combination with js. A few years ago I wrote a custom 404 page (I can’t use it now, since OpenBSD’s httpd doesn’t support them), that included a dialogue which changed it’s color 4 seconds, using this code:

    var r = Math.round(Math.random() * 255),
        g = Math.round(Math.random() * 255),
        b = Math.round(Math.random() * 255); 
    cont.background = "rgba(" + r +"," + g + "," + b + ",0.5)";
    cont.borderColor = "rgb(" + r +"," + g + "," + b + ")";
    cont.color = "rgb(" + (255 - g) +"," + (255 - b) + "," + (255 - r) + ")";
    

    Later on I found out that ints have a toString function that takes a base as an argument, so it isn’t really that incredible…