Now we're going to edit HTML/blocks/block-Modules.php

We're looking for the line:

    $ThemeSel = get_theme();

Right after it put:

    if ($ThemeSel=='yourtheme') {
    $side = 3;
    }

Save the file to your site, and test.
 (make sure you have selected the right theme in Your Account!)

Test it, goto your account and change themes. Only when the theme we just modified is selected should this change happen.

Congradulations! You can now add graphics to your Modules block.