@MacSparky said he uses 1Password to generate fake UUIDs for notes.
I need to make UUIDs all the time for work. Fortunately Mac OS X ships with /usr/bin/uuidgen
which can help with that.
To turbo charge this, just add a TextExpander snippet, and set the content to Shell Script:
#!/bin/bash
/user/bin/uuidgen
Saves me a lot of time!