Hi,
You can open css > layout.css and find this code
.social_bookmarks_rss a{ background: transparent url(../images/icons/icon-rss.png) center 0px no-repeat; }
Now find this code for the rss hover
.social_bookmarks_rss:hover a, div .social_bookmarks_rss .css_3_hover {background-position: center -43px ; background-color:#ffa133; }
Notice the background color? Get that and place it on our first code, something like this
.social_bookmarks_rss a{ background: transparent url(../images/icons/icon-rss.png) center 0px no-repeat; background-color:#ffa133; }
Do this for every social icons. Though changing the color of the actual image will work too.
Regards,
Ismael