You can create a custom banner or header out of a Picasa collage for your blog or website by using Free-Image-Editor.com. Here are the steps. There are many banner creator sites you can use, and the steps below serve as an example of banner creation.
1. CREATE IMAGE. In Picasa or your preferred photo software select a group of photos, and click to choose the option "collage" which offers either a "grid" or "picture pile."
2. CHOOSE BACKGROUND. Choose the background color if you chose picture pile and save the file.
3. GO TO AN IMAGE EDITOR. Go to Free-Image-Editor. com and click "Open" under "File" in the menu at the top.
4. UPLOAD IMAGE. Click on "Upload" and browse to select your picture. You might want to upload it at 50% or a size of your choice.
5. SELECT BANNER SIZE. Click the scissors icon to type in the width and height. For a custom theme template that you create in typepad you can change these from the pre-defined. Enter the size you are using for your template.
6. CREATE BANNER TEXT. Click on the "T" icon and enter the text, font and color for your banner. Then click on it and move it to the desired location.
7. APPLY CHANGES. Click "apply" and then click "File" and "Save."
8. UPLOAD NEW BANNER TO BLOG. Next, go to the custom design and custom banner upload section of the dashboard on your blog and upload the new banner image.

