Apple plans major design changes to its MacBook and MacBook Pro laptops, marking the move to become a "greener" company.

AppleInsider cites sources to bolster its claims, which state that both models of Mac will see major design changes in their next refresh.

The MacBook will move from a plastic to an aluminium and stainless steel enclosure, and a move away from a white body. MacBook Pros will ship in a new look reflecting the aluminium iMac and the MacBook Air, and will carry the MacBook Air keyboard.

The report speculates new model laptops will appear by the middle of the year, preceeded by the launch of new iMac and Mac mini systems.