I completely agree! The Halloween theme is so much fun, and I really wish GitHub offered more built-in theme options throughout the year.

Since that's not currently an official feature, here are the best community-driven solutions available if you want to customize your graph's look:

• Browser Extensions (For Personal Viewing):
You can install extensions for browsers like Chrome or Firefox that inject custom color palettes onto your GitHub page. This changes the colors for your own viewing experience on the GitHub website.

• Third-Party Generators (For Your Public Profile README):
This is the most common solution for a publicly visible, themed graph. Tools exist that generate a customized SVG image of your contribution statistics using popular themes (like Dracula, Monokai, Solarized, etc.). You then embed this image in your profile's README.md file.

Example of a Themed Graph Generator:
https://github-contributions.vercel.app