As far as I am aware, there isn't a handy, up-to-date 'catalogue' of FaceIDs - though I have thought about preparing one. FaceIDs are a bit random and there doesn't appear to be much of a rhyme or reason as to how, where or why they are added, though I would be curious to learn more about them. It's easy enough for you to create your own 'catalogue' of FaceIDs if you're really interested, though - essentially, it's just a matter of looping through a range of numbers, and then copying and pasting each FaceID to a worksheet. I can dig out some code that accomplishes this if you like. Alternatively, there are addins to Excel that will generate a tab in the ribbon and display a select range of them. When I tried to make my own catalogue, I recall that the last FaceId I could find was around the #18000 range, but that's not to say that there are 18000 FaceIDs. There can be hundreds/thousands of blank ones in between each of them!
But may I ask what you wanted them for in your Userform? I'm curious because I can probably save you some time or come up with a better solution. For example, you may be better off using the newer imageMso - these are the images you see used in the Ribbons and throughout the Office product suite, whereas FaceIDs are those images that you see in the VBA Editor.