The following is the abbreviated list of countries. They are listed alphabetically, so once all the countries starting with a particular letter filled up, I've removed it, just to make things a little cleaner and neater.
If you would like the more detailed list, and perhaps reasons why some nations are on this list while others are not, along with images of the flags, go here: http://en.wikipedia.org/wiki/Countries
If the country you would like to do has a name next to it then it has been claimed already. Please review the list again and find another that does not have a name.
To sign up, please scroll down to the bottom of this post, where you will find a Comment/Leave Comment button. Click on "Leave Comment," then leave your name and the country you would like to create a flag for.
The following are the only flags left unclaimed:
Northern Mariana Islands