[android-developers] what can be changed in how android looks on phone?

there is of course possibility to change wallpaper, i know that font
can be changed, but its for rooted phones only. is there anything else
what could be customized without root access?

i am 99% sure that application without root access can't mess with
other application resources, so the answer to this is most probably
one big NO. but i need to be sure

thanks in advance

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