I like a mix of caster sugar, brown sugar and plain tea biscuits, I use Arnotts Marie biscuits. Put in a food processor and pulse until it looks like sand. You need to play around with the ratios a little depending on what type of sand you want ie for a darker wet looking sand add more brown sugar, for a lighter dry looking sand - more caster sugar and biscuits.
AI use a mix of vanilla wafers and 1 single oreo. It gives it a nice texture. Hope it helps!!
AI used just graham cracker crumbs on this one [IMG]http://cakecentral.com/content/type/61/id/3010611/width/200/height/400[/IMG]
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