blue/green annual for full sun

Duxbury, MA(Zone 7a)

I'm planning next summer's garden and need some blue/green color for full sun. I need to fill an area about 1 sq yard, all I can think of is cabbage, I guess if I planted a bunch of plants close together, they wouldn't form huge heads because they wouldn't have room. Any other ideas? Ideally a foot tall or less

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