I understand that many users are not creative nor have the skills to use Photoshop, I used to be able to relate to this a time ago. To be honest, Photoshop is quite easy to master if you take the actual time to sit down and look around at it for a bit. So I made this a bit easier for everyone that needs help. Below are links to sites that hold logos for sites that you are able to edit in Photoshop since it being a PSD file.
Sites with PSD Logos
http://www.logoinstant.com/
http://www.shaboopie.com/
http://designmodo.com/psd-logo-templates/
http://whaze.com/30-free-psd-logo/
http://lava360.com/download-30-high-quality-free-psd-logo-templates/
In order to edit these logos, you need to have a version of Photoshop, a nulled one is fine, here is a link
http://thepiratebay.se/torrent/7134371/Photoshop_CS5_Extended___Magic_Keys__)
You are going to want to follow the instructions on that page or within the file on how to install it, it is easy.
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Now, inorder to edit the photos you need to place them inside of Photoshop. Doing this is simple, just open Photoshop and drag and drop the logo PSD into the program.
From here its all cake, go over to the left to the side bar and look for this symbol:
Click on that symbol above and move over the text you want to edit on the logo, or if you want to remove something. The stuff like images, backgrounds, etc are all called "Layers" so they should have that in their names.
Click the text and right click it, it will show the box above and say the text inside the little dropdown as shown above. Click the text you want to edit as show and then save the image as a .png and name it logo.png. This is when you place the logo in your FTP where your themes logo is to replace it. Doing all of this gives you a nice and new logo.