So, I found some cool buttons and stuff, and I will show you how to use them! Replace any text in red. They will end up changing colours when you hover over it as long as you put it in the HTML Gadget.
DeviantART Icon
<a href="http://Yourusername(replace).deviantart.com/" target="_blank"><img src="http://www.chibi-kingdom.com/ck/images/temp/smicon_glass_deviantart.png" style="width:55px; border:1px solid gray; cursor:pointer;" class="roundCorners" alt="DeviantArt" title="DeviantArt" onmouseover="javascript:this.src='http://www.chibi-kingdom.com/ck/images/temp/smicon_glassLit_deviantart.png';" onmouseout="javascript:this.src='http://www.chibi-kingdom.com/ck/images/temp/smicon_glass_deviantart.png';"></a>
Facebook Icon
<a href="https://www.facebook.com/Yourusername(replace)" target="_blank"><img src="http://www.chibi-kingdom.com/ck/images/temp/smicon_glass_facebook.png" style="width:55px; border:1px solid gray; cursor:pointer;" class="roundCorners" alt="Facebook" title="Facebook" onmouseover="javascript:this.src='http://www.chibi-kingdom.com/ck/images/temp/smicon_glassLit_facebook.png';" onmouseout="javascript:this.src='http://www.chibi-kingdom.com/ck/images/temp/smicon_glass_facebook.png';"></a>
Twitter Icon
<a href="https://www.twitter.com/Yourusername(replace)" target="_blank"><img src="http://www.chibi-kingdom.com/ck/images/temp/smicon_glass_twitter.png" style="width:55px; border:1px solid gray; cursor:pointer;" class="roundCorners" alt="Twitter" title="Twitter" onmouseover="javascript:this.src='http://www.chibi-kingdom.com/ck/images/temp/smicon_glassLit_twitter.png';" onmouseout="javascript:this.src='http://www.chibi-kingdom.com/ck/images/temp/smicon_glass_twitter.png';"></a>
Tumblr Icon
<a href="http://Yourusername(replace).tumblr.com/" target="_blank"><img src="http://www.chibi-kingdom.com/ck/images/temp/smicon_glass_tumblr.png" style="width:55px; border:1px solid gray; cursor:pointer;" class="roundCorners" alt="Tumblr" title="Tumblr" onmouseover="javascript:this.src='http://www.chibi-kingdom.com/ck/images/temp/smicon_glassLit_tumblr.png';" onmouseout="javascript:this.src='http://www.chibi-kingdom.com/ck/images/temp/smicon_glass_tumblr.png';"></a>