Nova launcher question

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http://androidforums.com – Hi, I'm using AOKP 4.2.1 (MR1) build and I'm trying to customize my home screen. I've downloaded nova launcher and also 2 icon theme packs (Metrostation and Holo) and the problem is that I go into nova settings, change the icon theme but then nothing happens. I've tried rebooting after changing the theme but nothing works, all icons stay the same. What am I doing wrong? I've never really seriously customized my home screen (desktop) so any help/ideas are appreciated. Miguipigui (General)