This is where pictures will be stored, which can be used for the header. My header design has three lines, the bottom two of which link to various other pages in my network of userpages and subpages. The top line is broken down further. One line will spell out the username using some free images from either here or over at Commons, one will say "This is", again using free images, then there is two other boxes. The two side boxes have a free image, no real reason for choosing that one other than "I like it" or a shield or flag in it.
Top row
Middle lines
Letters
These are the letters for where text is required. These pictures (vaguely) resemble letters. There will be at least three per letter.
Numbers
As above.
Side Boxes
These images would go in the side boxes. They might be to show a particular interest, or be completely random. It's up to you!