Icons are a important part of any application so here is a few nice free collections I have come across that you might find helpful. You can add add a icon to a button like this:
Button {
graphic: ImageView{ image: Image{ url:"{__DIR__}icon.png"}}
}
assuming the icon “icon.png” is in the same directory(package) as your source file.
Developpers Icons by Sekkyumu
Basic set by prokofusha
Free Vector Icon Set by monofactor
Lots more nice icons in this Smashing Magazine article 40 Professional Icon Sets For Free Download
Awesome! Thank!
Note:
The last one is not licenced for commercial projects it seems. The first two are when I did understand everything correctly.