Icon sets 24x24-infox and 48x48-infox use 15 colors only.
Very nicea idea to have such sets, but most (if not all) seem to eat a huge number of available pens. Would be nice to see some spartan low-colour versions with no backgrounds added. These would also be easy to theme like a couple of sets seem to be: by slapping them on a background.
If only you could use vector icons loutside IRIS... =)
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