TextMate doesn’t have block code syntax highlighting for some reason. Here’s what I added to the Textile language in the Bundle editor, right after the blockquote portion:

{  name = 'markup.raw.textile';
  begin = '(^bc([<>=()]+)?)(\([^)]*\)|{[^}]*})*(\.)';
  end = '^$';
  captures = {
    1 = { name = 'entity.name.tag.raw.textile'; };
    3 = { name = 'entity.name.type.textile'; };
    4 = { name = 'entity.name.tag.raw.textile'; };
  };
  patterns = (
    {  include = '#inline'; },
    {  include = 'text.html.basic'; },
  );
},