If you thing that bitcoin's logo design is the thing that's stopping it from going to higher prices, you're way off, altho i agree that it should be promoted much more, via it's related services and what not,
but that's not happening on a large scale because there is no central company or man to benefit from such an investment, so the best chance remains in services. More exactly; owners of services promoting
their business and hence promoting bitcoin as well.
i agree, bitpay, coinbase, bitstamp, kraken should be the people pushing for advertising. as for the logo..
even visa tries to change its logo
so try making something new and then send it to the main bitcoin service companies and give them the freedom to use the logo in all there advertising... but make sure its good, better then previous versions otherwise it will just get ignored.