[@joeycbee]
Some help from a website and some inspired cheeky editing~

Basically, write up an [img] within a [url] like so:
[code][url=<YOUR STEAM COMMUNITY>][img]<DIRECT LINK TO YOUR IMAGE>[/img][/url][/code]

You can get the image generated at http://steamsignature.com/ There's a few other websites, but this is my personal preference simply for the aesthetic.