Krodal:
Since the toneAC library is ideal for kids toys (extra loud, no nasty clicks, volume control), these kind of sounds came to my mind. But so far I could not make something that sounds right.
If you'd like to post your sound effect sketches to the toneAC library page I believe I can arrange it. You need a Gmail email address and let me know what it is and I'll try to set it up for you. Never done it before, but it seems like it's possible.
Tim