Board Thread:General Discussion/@comment-4811366-20130818045220/@comment-4656717-20130818051619

Find a blank one on wikipedia commons (preferably one with a licence allowing people to use it) and then edit (ie add in the borders you want for your timeline) it using photoshop or fireworks or another such program.

And voilà, you will have your very own professional-looking orthographic map.

I hope that's helpful.