Browse through these mod guides and see if anything inspires you

[ol]External Mods - http://www.macmod.com/content/category/3/36/2/[/ol]
[ol]Internal Mods - http://www.macmod.com/content/category/5/43/2/[/ol]
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MacBook 2GHz Intel Core 2 Duo w/ 2GB DDR2 RAM & 120GB SATA 5400RPM HDD
Canon Rebel XTI
Google Cr-48 Beta Laptop