there are many other designs available from a few artists. Hive account@joshoeah has put together some nice stuff... a lot of it is available on github in our community branding repo: https://github.com/gridcoin-community/Gridcoin-Marketing

as well, you can ask around... joshoeah just gave me a super high res version of this image to use to prevent aliasing: https://spideroak.com/share/N4YFAZLQOBSXEMDP/public/d%3A/Gridcoin.Tools/Share/GRCHighRes.zip