De FLOSS founders were thinking that an appropriate and engaging logo would be Tux riding a honey badger and pointing the way. First, lets meet our mascots.
This is Tux, the Linux mascot.

Here is Tux being a gentlemen, for the annual GNU Ball.

Finally, we see Tux showing his true colors.

This is the honey badger.

Honey badger is famous for not caring about your petty problems.
Honey badger is the official mascot of Bitcoin.
The proposed Guildcoin is planned to be a sidechain using Bitcoin as a reserve currency. De FLOSS Guild's currency will be backed by Bitcoin, but the guild will provide material support and engage the broader FLOSS community.
The rules of this contest are as such:
1. All submissions are to be posted in this thread and given a creative commons license. De FLOSS Guild will purchase the winning design for 0.5 BTC, and will maintain its CC license.
2. All submissions are due within 24 hours from the time of this posting. (by Wed Dec 16, 2015 9:15 am UTC-5)
3. The final decision will be made via vote by Guild members. Votes of non-guild members will be considered but not counted in the final decision.
This post will be updated to reflect contest updates. If there are questions or general discussion, we'll respond in the thread. Thanks, and good luck!
[UPDATE] The contest has been extended to Wed Dec 16, 2015 9:15 pm UTC-5, to allow at least one more submission.