To make kernel and rc scripts vomit rainbows while starting up you'll have to modify kernel and rc scripts to achieve that.
If you want to display ls output colorfully then you can either use -G flag on ls (read ls man page for more information on tuning colors) or use gnuls from ports (misc/gnuls) and change colors with dircolors (comes with gnuls).
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Fhtagn nagh Yog-Sothoth
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