There is one product that gives you a crackled effect. On a white surface it gives you an aged look, but slightly yellow.
If you take a look at my homepage you'll find one mask with which I've use this technique. The URL is http://homepage.mac.com/owlmoon1 and the mask's name is Ivoire. Further down you can also find Demon for which I've used the medium on a red surface.
For the product I've used, go to http://www.pebeo.com website and type crackling effect in their search box,