I like the teal as a first border and got it into my head to do a checkerboard for another border.
First I added a small 1.5" raw bright yellow, and luckily that added amount helped the 2.5" squares fit perfectly. Another yellow border is on, and I think from this point, it might work to simply do borders with cornerstones and get the whole top to a decent lap top size. I think the other brights can be cut in jelly roll size and just create a random back. As I look at the pic, black might make a good addition for the next one just to bring in the black again. I also have a 6" Friendship block pattern I want to consider.
While I am happy with how it is evolving, like the others for Hallows, it won't get finished until next year. I am in no hurry. What I need to remember is the note-to-self.