Blogger With Heart and Hands has a nice summary of the image's use in the Shaker tradition, as well as by the fraternal organization of Odd Fellows . . .
. . . which brings me to these amazing carvings, first used as ceremonial staffs for Odd Fellows gatherings. This matched pair was sold by aptly-named Odd Fellows Art and Antiques:

Check out their site for a veritable gallery of Heart-in-Hand carving, as well as other to-die-for folk art.
I like the silvery finish to this hand, offered by VanDeest Antiques:

Maybe the silver paint reminds me of the Tin Man, who only wanted a Heart.
It's rare to find these emblems for sale, but Ruby Lane seller Finish Line Collectibles offers this outstanding cast iron heart-in-hand marker:

Here's hoping we all act with with hearts in hand this holiday season.