Tandye, who may or may not be scouring Etsy for new werewolf costume parts for me, found these great resin werewolf claws by Dark Matter Props. These claws
are between 1 1/2 to 1 7/8 inches long from one end to the other, Each set comes with 10 claws (adhesive not included). The claws are marked on the inside to let you know which finger they go on.
The claws are made from a tinted semi-translucent urethane plastic casting resin and then treated to a black/brown wash and sealed. The black/brown wash really brings out the details of the claw-like texture. The result is beautiful. They can be made in black or other custom colors upon request.
According to the product page, these claws can be attached to your own nails with prosthetic appliance/nail glue, and you’re encouraged to further customize the fit with a little sandpaper and squinting. Once you get them on, refrain from doing any Three Stooges routines or vigorous scratching, because these claws “come to a semi-sharp point (such as that found on a plastic fork)”.
These would be a great alternative if you don’t have the patience or the materials to sculpt your own.