If you are a git user, you can install the theme and keep up to date by cloning the repo:
git clone https://github.com/dracula/psychopy.git
Download using the GitHub .zip download option and unzip them.
cp ~/psychopy/dracula.json ~/.psychopy3/themes
Preferences > Application > theme > dracula : OK
Get updates about this theme and more. 5,989 people enjoy it.
This theme wouldn't exist without these people. Wanna help too? Check the repository on GitHub.