The Sign-In with Ethereum brand assets include the logo, logomark, and icons associated with the project.
All of the assets in this directory are being released under a CC0 1.0 license (see: license.md in this directory) for the public to use and incorporate them where they wish to.
For those incorporating Sign-In with Ethereum into their project and require a button for users, one design has been included in the set of included assets, but some additional designs have been provided by Cousin Eddie#5625 in the Spruce Discord server with confirmation of a CC0 waiver.
Those examples can be found here.