Here is a copy of a generic model release which I use with my logo in the blank spot at the top. These are in .jpg format, and print out on an 8.5X11 sheet. Just right click and select "save as" to save it to your hard drive.
When filling in your name, also use any pseudonyms you use, like your submitter name and/or your company name, like this:
Jan Gracey Stinson (aka Gracey, J. Stinson, Photography of Grace)
Generic Model Release (for adult models)
Generic Model Release for Minors
If you submit to multiple sites check the model releases for each site and add whatever is necessary to a generic release for each site - this way you can use one release for each site you submit to.