kameleonosis

Visual Tools adds a customizable control panel for admins to apply global visual changes — such as font size, spacing, background and text color — across the entire website.

visual-tools-front-end-panel

Provides global visual customization (font size, spacing, colors) for WordPress admins, with live preview.

fpoller

Allows for resizing of tag cloud font sizes from within the admin panel.
Gives two configuration options for the tag cloud
<ul>
<li>Smallest size</li>
<li>Largest size</li>
</ul>
and adjusts the font sizes accordingly.

Resize tag cloud

Allows for resizing of tag cloud font sizes from within the admin panel.

visual-tools-front-end-panel vs Resize tag cloud