It is very easy to make a theme.

If you want to create your own theme with photos of you, just convert the photo to .png and and resize it to 128 x 128. Rename the photo "Background.png".

Then import it to any original theme, replacing the background.

Also, replace the original "animation.png" and "icon.png" files with blank ones, so nothing crosses in front of your wallpaper.

Have fun :)