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/abap.git
Download using the GitHub .zip download option and unzip them.
%APPDATA%\SAP\SAP GUI\ABAP Editor\
abap_spec.xmlfile with the downloaded file with the same name. (It's advised to copy the original file to another location as a backup.)
To customize, open abap_spec.xml, and change the nodes inside the COLORSYNTAX tag.
For each TextType node, change either "clr" or "bkclr" properties, using the following internal codes:
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This theme wouldn't exist without these people. Wanna help too? Check the repository on GitHub.