Q: How can I replace the Gmail logo?

A: If you use Google Apps for your domain, Google provides this feature. The logo can be uploaded and set in your "Manage domain->Domain Settings->Appearance":
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If you use a "normal" Gmail account (@gmail.com), a custom stylesheet can do the trick as Mailplane supports such a stylesheet. It can be set in your Tweak UI preferences.
Here is an example CSS file:

.zYsCRb {background:transparent url(http://mailplaneapp.com/downloads/logo-custom.gif) !important; }

Upload a correctly sized image (
143 x 59 pixels) to any webserver and replace the URL in the example with the URL to your logo. Important: The picture will be shown in all account you use.
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