First of all, I don't recommend the "Toypedo" as something to play with at a safety stop - having played with these things extensively, I can guarantee that it'd screw up your "stop" as you'd be going up and down to catch the thing. (They are great fun at depth, where you can go up and down a few feet).
For safety stops, there is usually enough sea life around in the planktonic soup to keep one amused for three to five minutes - you just have to bring your view in nice and close and pay attention.
For deco stops it's not a bad idea to have something to read. Depending on how fast you read, tear out enough pages from a paperback to cover your stop and take 'em along. As you read just tear off the pages and stuff 'em back in your pouch, and throw 'em away after the dive. Don't take too many pages, 'cause once they're wet it's read 'em underwater or trash 'em unread after the dive.
Rick