Just heard about the contest last night... had to get right on it!
Here's my entry for the 2018 @phelimint Steem Silver Round Design Contest:
In this second version below I've removed the steemit.com logo and replaced it with the STEEM logo along with an adjustment to the year:
I choose to flip the dolphin on the left side to mirror the one on the right... since the "6-9" orientation was only utilized on my first design in order to match the shape and indentations of the steemit.com "S" logo (which has since been removed).
NEW SECOND DESIGN BELOW (just added to post):
All content 100% original by John Deecken @orionsbeltbuckle