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Haven't seen one but there are two ways to go about it. Buy any regular case that will fit your macbook. Make a stencil in the shape of an apple logo what ever size you want. Spray paint it onto the case. You could also make a custom logo from fabric and stitch it on to said case if it is one of the ones made from cloth.
 
or you could get the clear smoked incase soft touch hardcase and see your apple logo right through it...looks really nice
 
I decided to order this:

ekapplebag.jpg


http://cgi.ebay.com/ws/eBayISAPI.dll?ViewItem&item=130444159700&ssPageName=ADME:L:OU:US:1123
 
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