"<A HREF="http://www.ravelry.com/people/yourusernamehere"><IMG SRC="http://badges.ravelry.com/rectangle_32.pngf"></A>"
Can paste the above code in your signature box in user settings.
Where I put yourusernamehere......that means your username from ravelry.
Like mine for example:
You can copy and paste everything between the quotations
then just fill in your own username. Make sure the quotations at the beginning and end is not
Also, if you want a different picture you can find different ones here http://www.ravelry.com/wiki/pages/Ravelry-inspiredworks
. Just replace the one I have in code with the one you want.
Hope this helps!