Open terminal from Applications/Accessories/Terminal,create a file

gedit filename

copy and paste all URLs into this file(one url as one line).

 http://img.feedsky.com/images/icon_sub_c1s17_d.gif   
 http://img.feedsky.com/images/icon_subshot01_zhuaxia.gif  
 http://img.feedsky.com/images/icon_subshot01_pageflakes.gif  
 http://img.feedsky.com/images/icon_subshot01_rojo.gif  
 http://img.feedsky.com/images/icon_subshot01_google.gif  
 http://img.feedsky.com/images/icon_subshot01_netvibes.gif  
 http://img.feedsky.com/images/icon_subshot01_yahoo.gif  
 http://img.feedsky.com/images/icon_subshot01_newsgator.gif  
 http://img.feedsky.com/images/icon_subshot01_bloglines.gif  
 http://img.feedsky.com/images/icon_subshot01_xianguo.gif  
 http://img.feedsky.com/images/icon_subshot01_nazha.gif  
 http://img.feedsky.com/images/icon_subshot01_youdao.gif  
 http://img.feedsky.com/images/icon_subshot01_qq.gif  
 http://img.feedsky.com/images/icon_subshot01_douban.gif

Then run this command to download from all URLs:

wget -i filename