Nautical themed coasters set of 4.
Too bad I missed the contest.
I used some left over insulation foam for feet. I recommend not using anything thicker than about 1.5mm, as the coasters will start to sit proud of the holder.
The models are my work, but the designs on them are not:
Waves - https://www.freepik.com/free-vector/abstract-waves-logo-concept-set-nine_8865999.htm
Anchor - https://www.freevector.com/antique-illustrations
Wheel - https://www.freepik.com/free-vector/anchor-steering-wheel-black-white-illustration_11526539.htm
Compass & Lighthouse - https://www.freepik.com/free-vector/nautical-icon-set_9398286.htm
Ship - https://www.freepik.com/free-vector/vintage-sailor-naval-set_9586144.htm
The author marked this model as their own original creation.