You bet, I got it from a previous GM who had everyone use it and I have to admit I really liked it too. I've seen some rally cool things done with code and am making an effort to learn it. Here is what I did:
If you just want the frame use [fieldset]Your post here[/fieldset]
If you want to add in the image into the frame line just replace the first fieldset with [fieldset="[img][b]your pic http[/b][/img]"], important to note that the image won't show in a preview only when you actually post it.
So, as an example, my post coding looks like this:
As she stepped through the doorway into the common room Zynka paused a moment to get a look at the patrons gathered there. Fiercely staring down any who meets her eyes she runs a quick tally in her head of what she sees, [color=green][i]Let us see, we have a fighter, farmer, fighter, fighter, fish, far - wait, wha!?![/i][/color]
Caught completely of guard with jaw hanging wide open she stares unabashed in disbelief for a few breaths before giving her head a quick shake and strides towards the bar. Letting the axe head thump to the floor with a bang she props the haft against a stool and drops her pack beside it. Massaging her temples Zynka looks down at Isaiah and says, [color=green][b]"A mug of ale, Innkeeper, the road today has been longer than I thought."[/b][/color][/fieldset]
Once I have what I like, I make a copy in a Word file so I can grab it for ease of use, happy coding!