Help identify this annual

Swung by a nursery yesterday and as I was perusing the annuals, I came across this little guy with no tag. The saleswoman told me that it maintains its purple foliage, has no flowers to speak of, and doesn't get much taller than this (about 8 inches I'd say), just fuller. I thought it would look great grouped with the orange and purple container theme I have going this year, so I bought it. But what is it?

My everlasting gratitude to whoever can help me.