
http://www.iconfont.cn/

http://www.iconpng.com/

http://www.easyicon.net/

https://thenounproject.com/

https://github.com/MahApps/MahApps.Metro.IconPacks

https://github.com/MahApps/MahApps.Metro.IconPacks

https://github.com/seayxu/FontAwesome

https://github.com/seayxu/FontAwesome
http://www.cnblogs.com/jiujiaoyangkang/p/4766724.html 圖標自適應
http://www.cnblogs.com/liulun/p/4217664.html