There are 6 repositories under ctfd-theme topic.
A Retro Styled CTFd Theme
Official and Community CTFd themes
CTFD Custom Theme
CTFd 中文汉化版
SigSegv2 CTFd theme
CTFd Theme for StormCTF (Updated a little bit for the newest version of CTFd)
CTFd (3.4.0) christmas theme! 🎄
CTFdを日本語化したテーマ
CTFd core theme (beta) translated into Greek / Το βασικό (beta) θέμα του CTFd στα Ελληνικά