What I tend to do when I can't find a theme that meets my needs is edit the background of another Theme.
My favourite to edit is
Nutz' PNG Goodness.
You can find that here;
PNG GoodnessInstall the theme on your forum. Find the image that you would like to use in the background, make sure its 1280x1024 in size.
Get the link to that Image.
You need to replace the background image on the current theme with yours so we need to edit the CSS for that.
Admin > Manage Styles > Modify Style > Choose the Theme you installed > Then go down to the CSS section at the bottom and and find this bit of code;
/* The main body of the entire forum. */
body
{
background-image: url(http://imageURLhere);
background-color: #000000;
margin: 0px;
padding: 12px 130px 4px 130px;
background-repeat: repeat;
background-position: center center;
background-attachment: fixed;
}
And replace the Image URL.
Hit save and your done.
Hope this helps and THANKYOU to NUTZ for the great theme!!