If you can't find the exact "Toxic Green Cool" version on Kuyhaa, many similar "Biohazard" or "Neon Green" themes are available on community sites like DeviantArt. These often feature: with neon green borders.
To use third-party themes (visual styles) on Windows 7, you usually cannot just double-click a file. You often need to "patch" your system files first: tema-windows-7-toxic-green-cool-kuyhaa
While Windows 7 is quite old and Microsoft no longer provides official support, many users still enjoy personalizing it with custom visual styles. Based on your search, here are a few things to keep in mind regarding this specific theme: 1. Where to find it If you can't find the exact "Toxic Green