For example: d0ff:eefa:10::faff:92:0 (though there are currently no addresses in use that start with d.)
Vanity IPv4 addresses like 8.8.8.8 exist because most addresses have been allocated, so companies with money can go hunting for nice ones. There aren't many IPv6 addresses like 2600:: because internet registries don't allocate them on purpose, and I'm not sure if anyone's cared enough to bribe them.