I know I've seen people (in the past) looking for block lists specific to their country.
Here's one example:
In my research into filtering any/all blacklists, I started making sure each line had a valid domain extenstion. (ie. .com .net .ru .tv etc...).
I took the process one step further and I now generate lists based on Country Code TLD's.
Check them out Here:
Looking for feedback on these as well.