You did a great job on it! I know it was a real chore and you must be relieved to have it almost done! I am probably not much help on border suggestions as I do not normally do borders on most of my quilts. But you do need one to Finish the blocks on the edges. I would make the border (in the same background fabric) the same width as your background strip between the 2001 block and the long rectangle block underneath it. Your teal border sounds perfect.