How to change icons for minimize, maximize, close buttons

[TRZALICA]

I would like to know how to change icons for minimize, maximize, close buttons.
I can't find those png files that I can substitute with some other png of the kind of buttons I would like to use instead those standard ones...

[xenopeek]

I've moved your topic here from Tutorials / Howtos section. Please don't post in the Tutorials / Howtos section unless you have a tutorial or howto as guide for others on how to do something (See the forum rules at the topic of that section; it's not for support questions.)