Is there a dropbox-sponsored icon we can use for the button that users click to start the OAuth process?
No, we currently only offer the approved Dropbox logos available in the branding guidelines:
https://www.dropbox.com/developers/reference/branding-guide
I'll send this along as a request for some specific assets for this, but I can't promise if or when that would be done.
Thanks Gregory. Let me know if anything is created.
