Congratulations! You discovered the most obscure place to find primary song arrangements on the web. Even if you’re not a member of the Church of Jesus Christ of Latter-Day Saints, most of the songs have uplifting, nondenominational messages. (Which you can use to brainwash your children into making good decisions.)
(original song based on a Saint-Saens favorite)
(original SATB piece based on Rachminoff's Scherzo in D Minor)
Note to Primary Pianists: If you plan to use one of these arrangements during Primary, be sure to clear it with the Primary President and Bishop. And make sure the children are very familiar with the original version. Some of these are difficult and it may be too frustrating for the kids. Let me know if you have any requests.