This design pack makes five different Star Trek-themed charms, some explicitly Christmas-themed but others more general (at least, if you make them in non-gingerbread colors).

Because it's a freebie (I don't like selling things I don't have rights to), it's just got the general charm instructions, but they're pretty standard.

The files come in all the formats Ink/Stitch can produce, along with the SVG source file that you can edit or resize in Inkscape+Ink/Stitch. As far as I'm concerned you can sell items made from these designs, but the Star Trek rightsholders might have more to say on the subject.