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    <p>You need to use a pseudo random number generator (PRNG), with a fixed start seed. The Math.random method in javascript is a PRNG, but you can't set the seed like you can in other languages.</p> <p>A PRNG is reasonably simple to create - lots of code on the internet. Given a fixed start seed it will always generate the same sequence of random numbers, which is what you're asking for.</p> <p>Whether those colors look pleasing or not, is <a href="https://stackoverflow.com/questions/43044/coloring-algorithm">another question entirely</a>...</p> <p>One javascript implementation with seeding capability:<br> <a href="http://www.erikoest.dk/rng2.htm" rel="nofollow noreferrer">http://www.erikoest.dk/rng2.htm</a></p> <p>You'll also find C implementations (easy to convert to javascript) and other details of building your own PRNG of the Lehmer type here:<br> <a href="http://www.google.com/search?q=Lehmer%20random%20number%20generator" rel="nofollow noreferrer">http://www.google.com/search?q=Lehmer%20random%20number%20generator</a></p> <p>Another one with code (<a href="http://en.wikipedia.org/wiki/Mersenne_Twister" rel="nofollow noreferrer">Mersenne twister</a>):<br> <a href="http://www.math.sci.hiroshima-u.ac.jp/~m-mat/MT/VERSIONS/JAVASCRIPT/java-script.html" rel="nofollow noreferrer">http://www.math.sci.hiroshima-u.ac.jp/~m-mat/MT/VERSIONS/JAVASCRIPT/java-script.html</a></p> <p>This question covers several types of PRNG in javascript:<br> <a href="https://stackoverflow.com/questions/424292/how-to-create-my-own-javascript-random-number-generator-that-i-can-also-set-the-s">Seedable JavaScript random number generator</a></p> <p>If you give the same starting seed to the PRNG at the beginning of the function, it will always return the same number sequence with each successive call.</p> <p>Convert that number into a color, and you're all set.</p> <p>-Adam</p>
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