Ok, I played around with things a bit, and here is what I found.
- I can make a document with all the standard image bullet from the OSX version of Pages and import it to the iOS 5 version intact.
- I can copy a list from the imported document to a new document and use it to create a new list.
- Each indent level must have it's own image, so when you copy a list you must also copy all the indent levels you want.
- If you delete all indents on a level, you lose the image for that level.
So this is what I did, and how I made it work.
Make a document with all the standard images with 5 indent levels. That is more than I normally use.
When you want a new list, open the Bullet Template file, copy the style you want with all indents, then paste it to the new document.
Start adding and/or changing the list that way you want; except Do Not Delete any indent levels until you are finished (or have new list items on all the levels you want). If you do, you lose the image on that level.
It's not a very good method, but if you need/want alternate bullet images, this is all I can come up with. Here is a link to public Box.net folder I created for various iWorks templates I choose to share with the forum. The Bullet Template document I created is there. Feel free to download it, or any other document that interests you.
Forum Stuff - Folder Shared from Box.net