I created these for you, my viewers! These are tif files with the background transparent. You can alpha them over video and get the gradient edge! These are static lower thirds, royalty free so use them in your productions. In Movie Edit Pro just drop them on the timeline under your video and they will show through. They are 720x480 for standard resolution but you can stretch them to 16:9 if you wish.
Right-click on this link and "save target as" or "save link as". Then download the lwrthrds.zip file. The lower thirds are in the zip file.
These lower thirds can be used with any video editor that has alpha capabilities.
Here is a video showing the lower thirds in action: