I think that the 12 year old RISC OS cog logo is OK. No worst that the 8 year old dull four panel Windows logo?
An estimation of quality by age level is quite amusing. Some of the artwork of a 12 year old at my school in New Zealand look like art museum quality. So maybe the RISC OS cog puts Windows at an 8 year old level at it's best? (Ha, just teasing humour).
I recall reading some time before somewhere that each spocket of the cog represents something to do with computers? Does anyone know about these sprockets?