Hi. I have a bunch of violets which volunteered in my pasture -- Common Blue Violet, Confederate Violet, others which are dark purple, red-purple, white, and various white/blue/Confederate mixtures -- but never saw one like yours.

I looked at 25 pages of a Google Images search for variegated violet and found these non-African violets which may interest you:

This one's growing wild, apparently in North Carolina; pity we can't see the foliage:
http://sites.naturalsciences.org/education/treks/spring_09/pages/21_Variegated%20Violet.html
Don't know if you can find contact info for anyone; here's what I get with the beginning of the url:
http://sites.naturalsciences.org
Here's the "education":
http://sites.naturalsciences.org/education/
Clicked on "treks" above; this looks helpful:
http://sites.naturalsciences.org/education/treks/
Apparently the photographer is/was at the NC Museum of Natural Sciences. Maybe they would have contact info?

When I clicked on this in the Image search results, it took me to a basic flickr page; I don't know if that means the photo is no longer on flickr or that I don't belong to flickr or what. In any case, this is the original size photo, courtesy of Google rather than flickr:

This is a British blog with a variegated sweet violet -- looks more like a garden viola to me, though.
http://plewspottingshed.wordpress.com/2013/02/09/roses-are-red-violets-are-blue/

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You might try posting on the Name That Plant forum.

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These members of the Viola genus can be found in NW Arkansas (unfortunately this info is from the Biota of North American Plant Atlas, which doesn't actually have photos or tell about them; nothing except where they grow):
Viola bicolor (promising name, but it's not yours)
Viola canadensis
Viola lanceolata (lance-shaped leaves)
Viola X lovelliana
Viola missouriensis
Viola X mistura
Viola X modesta
Viola nephrophylla
Viola palmata
Viola pedata
Viola pedatifida
Viola primulifolia (not yours)
Viola pubescens
Viola sagittata
Viola sororia (Common Blue Violet)
Viola striata (similar to the Confederate Violet)
Viola subsinuata
Viola tricolor
Viola X variarum
Viola walteri

If you want to see all the maps on one page:
http://bonap.net/NAPA/TaxonMaps/Genus/County/Viola
And here's the color key:
http://www.bonap.org/MapKey.html

Good luck!