From the SA Pulse Novelty set. Blanks are from grab bags, except 1.25u black caps are purchased from SP directly.
Make sure you pay attention to the profile and size of the key you want. If it says 'unavailable', that means the key doesn't exist.
Update: 11:16pm 11/20 - for some reason, some of the options are missing. I need to add about 10x different options. So if you see something is unavailable that should exist - check back shortly.