Rated 5 out of 5 stars
Almost exactly what I was looking for. Suggestions that would make it perfect, for me at least:
1. Make the background color configurable, or remove it. All I want is the number, and on some screens the background color makes it hard to read.
2. Use the value from X-Spam-Status rather than X-Spam-Score. This would make it match SpamAssassin settings, etc. without having to mentally convert it.
3. Drop all the zeros after the decimal, they don't do anything but take up space.