Charl, I was thinking the same for the butterfly.
Rocke,
There are professional archeologists and Lithics experts on here much more qualified than I am to answer your question but since none of them has responded yet I will tell you my thoughts.
It would help to know precisely or approximately where they were found. Lacking that, everything is an educated or opinionated guess. The lunate piece (on the left) doesn't match anything that I've seen in private collections or museums. It appears similarly shaped to a barbed axe but it is not polished and being made of what appears to be granite I would think it was either unfinished or something unknown (at least to me). I saw a piece similar to it in Buckland, Virginia but your piece is much fancier.
Atlatl's, or spindle weights depending on your preference, are very common finds where I live. Maybe yours is an intriquite bar weight? Perhaps a birdstone or boatstone or even a loafstone. Also, it could be an unfinished bannerstone but by definition, not a bannerstone by the lacking of convex features it was not a bannerstone in the making. In the 40's during an excavation in Ipiutak, Alaska something similar to the butterfly shaped stone was found but once again your image is in a class all it's own from what I've seen.
Could these be casts or reproductions?
Don't worry, friend. I'm sure an expert will be along shortly to correctly identify these. They look very interesting and if I found them I would sure be asking questions.
-Seadog