Halloween Afghan

I've ignored my advice about lead time and this afghan won't be ready for this year. I'm still not sure what colors I'll be using! Yellow and orange, for sure. I want a third color, but which? Brown? Burgundy? Black? I'll have to ask my daughter who has an October birthday. She likes Halloween.

 The basic pattern will be very like this, except the granny squares will be 3 rounds, instead of 4.

Also, I intend to join the squares by joining in the back loops. I just like the looks of this join.
So, I'll start with a few rows of yellow squares. Then, I'll start adding a few orange squares randomly, more squares of orange each row until each row is only orange. Then, I'll add squares of the third color, randomly, until each row is only the third color, then I'll put a border row of each color for 3 rows of border.
Simple, easy, and easily customizable by changing colors to whatever you choose.