Create a custom block.

my_module.install

<?php

function my_module_update_xxxx () {
  $query = db_insert('block_custom')
    ->fields(array(
      'body' => 'Some markup',
      'info' => 'Some title for info',
      'format' => 'rich_text',
    ));
  $bid = query->execute();
  db_insert('block')
    ->fields(array(
      'module' => 'block',
      'delta' => $bid,
      // Active theme.
      'theme' => 'my_theme',
      'status' => 1,
      'weight' => 0,
      // It places the block in content region.
      'region' => 'content',
      // It will be visible on all pages.
      'pages' => '',
      // It will use the info set above as a title.
      'title' => '',
    ))
    ->execute();
}