Anyone can create a graphic. Whether you can create a decent graphic is another matter. Your only other option is to get one created for you, which is going to cost (you can post in Custom Service/Development requests for this), or search the web for a suitable free graphic (though you'll have to make sure it's free for use elsewhere or you'll get slapped for just nicking one). Chances are any royalty free graphics are going to cost you.
Anyway you've been given the options, the rest is now up to you. Welcome to the world of being an admin on a website.
Chill out... I'll see if I can grab it for you.... are you talking about the fish image itself?
Well, looked around and can't find it, so either I'm looking in the wrong place or the original poster removed it. I know you got enough peoples over there knickers twisted that they weren't really willing to go out of their way to assist you.
I did have it on my computer still up until about 2 weeks ago, but went through a housecleaning of images I no longer needed and it went into the trash bin and was emptied.
Original image would not work since it's rectangular. I've modified it to be square (transparent background) and created the favicon.ico for you (it's the default 16x16px).
I'm working on making it larger for the logo_og.
It's going to take a bit as the background of your logo is transparent by default.. and your text is white - so the entire image has to be modified to give a solid background and then created in a square format.