I would recommend that you consider setting up your own account at File Submit. CLICK HERE to get more info or to set up an account. It's easy and free. You will get a link you can use if you have a website.
Remember to attach a readme file to your theme with your name and email or website.
Please make sure your theme has a *.theme file and isn't a bunch of unconnected sound and cursor files. See the utilities page for programs to help you with this part. Please use a standard sized format such as 800x600 or 1024x768 since many people set their wallpaper to stretch to fill their screen and non-standard sizes will distort on their screens.
Start "cold" and install your theme on your own computer to make sure you have included all files and have done everything properly. If I can't get it to work, I can't post it.
I would recommend that you consider setting up your own account at File Submit. CLICK HERE to get more info or to set up an account. It's easy and free. You will get a link you can use if you have a website.