If you want to change the Prefix Sticky: to look Gradient, Bold and Bigger Letters
Go to Admin CP> Languages and Phrases > Search in Phrases
Search for sticky_thread_prefix Select Phrase Variable Name Only then click edit
You can write anything in that for example if you want Sticky:
Code:
<FONT SIZE="3"><B>
<font color="#2f22ce">S</font>
<font color="#4a1fb1">t</font>
<font color="#651c94">i</font>
<font color="#801977">c</font>
<font color="#9b175b">k</font>
<font color="#b6143e">y</font>
<font color="#d11121">;</font>
</B></FONT>
You can change colors to your desire
Also you can use this page as reference helping you do the code for you by choosing the colors from start to end.
http://www.tektek.org/color/