I just learned recently that a "quiltie" is a miniature quilt, so I'm thinking of these as quiltie ATCs. They have interfacing in the middle instead of batting, so they're not as soft as a quilt, but they are pieced, quilted, and bound just as you would make a quilt.
These took ridiculously long to make. Maybe 5 or 6 hours of work, all together? It's hard to tell because I worked on them off and on all day yesterday. Time well spent, in my opinion!