If you want to create a signature that you can just insert into any OpenOffice document, you should use AutoText.
Write the signature as you want it, with or without a graphic. Select it all, and choose Edit > AutoText. Select a category, name the signature and give it a shortcut. Then, click and hold down on the Autotext button and choose New.
To insert the signature, type the shortcut followed by F3.
If you choose File > Send > Document as Email or the other email options under File > Send, then your email options will take over and whatever signature you use for email will be included.
This was first published in November 2006