After owning a creative freebuild server for, as of today, one year, these are some of the better builds we have seen (server details in the comments) : r/Minecraft
Minecraft - Freebuild City - Server Tour - YouTube
BuildersUnite | 1.12.2 | Creative Freebuild | Survival | & More - PC Servers - Servers: Java Edition - Minecraft Forum - Minecraft Forum
Serveur Minecraft Freebuild.fr – Liste Serveurs Minecraft Liste Serveurs Minecraft