Jenell - I like it! Subtle but effective! If you want to add a bit of pzazz then cubes would be great - if it were me I'd chose three shades of orange/yellow and try to position them so the dark sides butted up against the darker hexs and the light sides, the lighter hexs. To give a sense of transition. Hope that makes sense! You could also let a couple of hexs fall into the border - I'd go for a darker border if it were me, maybe a nutty brown colour? :-D