Here is an alternative method using CSS background images:
ul.bullet { list-style-type: none; margin: 0; padding: 0; }
ul.bullet li { background: url(bluetriangle.gif) top left no-repeat; padding-left: 10px; }
<ul class="bullet">
<li>One</li>
<li>Two</li>
<li>Three</li>
</ul>
If you only want the blue triangle on specific list items, you can also include a regular triangle image:
ul.bullet { list-style-type: none; margin: 0; padding: 0; }
ul.bullet li { background: url(regulartriangle.gif) top left no-repeat; padding-left: 10px; }
ul.bullet li.blue { background: url(bluetriangle.gif) top left no-repeat; padding-left: 10px; }
<ul class="bullet">
<li>One</li>
<li class="blue">Two</li>
<li>Three</li>
</ul>
You may need to make adjustments to the padding and positioning of the images to get them just right.
I hope this solution is helpful for you!