Cameo Carnival

I'm really enjoying puttering along with my EPP. Now that I have made the 'pattern' I'm trying to decide what to do to square it up because I have decided to make this into a cushion.  I'm not sure I love the idea of trying to applique it onto a base fabric (not a lot of faith in my ability to do this neatly) so I'm thinking of filling in around the pattern with more dark blue pieces until it is big enough for me to square off. Is there an option 'C' I haven't thought of?