TechRestore announced Monday a new matte finish LCD screen replacement service (link updated) for black and white plastic MacBooks, the original MacBooks that came with a glossy-only screen. The service is part of the company's 24-hour turnaround line of repair and upgrade services for various Mac and iPod product lines.
The service is priced at US$169, and includes the screen and return shipping, as well as the 24-hour turnaround time.
You can find more information on the service at TechRestore's Web site -- the 13" plastic-body MacBooks have been added to the existing options for the service.

Actual photo, provided by TechRestore.
The company said that the color differences in the case are due to reflections from the screen.

Bryan Chaffin 

A great product….and a great service by an excellent company.
Thanks TechRestore!
However, a huge shame-on-you to Apple for not giving buyers the option in the first place to have:
either a matte or glossy screen AND
either have no glass or glass or non-glare glass/plastic.
What a waste to throw-away (the cost of) a brand-new screen!
Why not give us a choice? Some of us actually care about our ergonomics and physical health from being on a computer all day long!