this is where a design wall really comes in handy---when i create a quilt containing odd sized/shaped blocks i lay them all out---and move them around- leaving gaps here & there where necessary- then start filling in those gaps with either additional pieced blocks or strips of fabric. it is fun to move them around and find the perfect layout-
you could fill in with pictures from your trip- or just fabrics that either blend or contrast- black really makes things (pop) in a quilt- but start with laying them out and see just what you need to (fill in)
be sure and show us pictures when you get it together- we love looking :)