Is there a way to force ubuntu to use and enlarge the tiny versions of icons?

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http://askubuntu.com – I'm writing a retro-gaming oriented theme. I wanted some medium-size pixelated icons to match, but it doesn't make sense to make up a ton when icon sets come with very cute, small versions of their icons. Is it possible to force ubuntu to use these icons, but enlarged and not blurred whatsoever? (HowTos)