Building kernel from source
http://wiki.cyanogenmod.com/index.php?title=Building_from_source
Install CyanogenMod for Nexus_One
http://wiki.cyanogenmod.com/index.php?title=Nexus_One
Compile CyanogenMod for Nexus_One
http://wiki.cyanogenmod.com/index.php?title=Compile_CyanogenMod_for_Passion#Download_Repo
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MetaMorph:
http://code.google.com/p/android-metamorph/wiki/MetaMorph
MetaMorph is an application for Rooted android phones that allows end users to apply customizable zip files with specific directories inside that can be applied to various apks, jars, or any other zip type format.
Specifically the goal of metamorph was to allow end users to apply custom themes to their android phones without having to boot into recovery mode and flashing a custom update.