I'd like to include the Google +1 button for my website:
<!-- Place this tag where you want the +1 button to render. -->
<div class="g-plusone" data-annotation="none" data-href="http://clrdraw.weebly.com/"><>
<!-- Place this tag after the last +1 button tag. -->
<script type="text/javascript">
  (function() {
    var po = document.createElement('script'); po.type = 'text/javascript'; po.async = true;
    po.src = 'https://apis.google.com/js/platform.js';
    var s = document.getElementsByTagName('script')[0]; s.parentNode.insertBefore(po, s);
  })();
</script>

But html is blocked in the signature   Any way around that?

You can use URL links on images, so you should be able to use the +1 image directly tied to a link in your sig.

And it's pretty obvious this one is using it too. A way around it would be to ask the admins to add a bb tag for it. Not sure it's gonna happen though.

Yeah I was sure about that actually.

The thing about the buttons those social sites give you is that they all use JavaScript

I think Twitter has an URL that allows you to make people instantly follow you if they click an external link. It can be hard to grab, though, and might not be a good idea since it might make some people upset (since they might not like to follow accounts without knowing).

You could try something along the lines of [url=javascript:<blah blah blah>]+1 Me![/url].

You could try something along the lines of [url=javascript:<blah blah blah>]+1 Me![/url].

I'm pretty sure this won't work. Plus the js code is also used to render the button.