In addition to Stehpen's good advice, many graphic programs also come with textured patterns you can use for backgrounds like Gary does on his site, but you may need an image editing program like photpshop to assemble them to look like a "page". I believe Gary's page actually contains a top, middle and bottom image to get that look.
If you can let me know exactly what dimensions you need I'd be happy to help you get something together gratis.
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