Customizing iPhone 3G S -WITHOUT- "jailbreak"

Hello Mac Users...

- Question...
Does anyone know if Mac is in the works for being able to "customize" the iPhone more, (like ringtones, text tones, voicemail tones, custom icons, animations and especially themes...) Something like what "Plazmic" is for Blackberry.

I've looked into 'jailbreak' and other programs used with Cydia and such and it's nothing but a confusing mess for me... LOL!

Any help is appreciated...
Thanks!