Suggestion:
That the profile theme editor be extended to support sections, with functionality to apply images to the section-headers.

Motivation:
Right now, as far as I'm aware, the only way to do quite what I've described above is to request access to the CSS editor. (But see my note below.) However, this seems like a fairly heavy-duty--and potentially dangerous--means of applying a fairly minor customisation, to my mind. Further, it requires waiting for approval of access to the CSS editor, which may take time.

Specifics:
I'm envisaging this as being incorporated into the "My Projects" section. I imagine there being a button for the addition of a section-header, which adds a new "header" entry into the project-listing (and which can thus be dragged up and down, just as can projects). Further, I imagine it incorporating a button which allows for the selection of a header-image, and/or header-text.

These headers would then define the sections of the page: I imagine that in the background somewhere the page-generator iterates through the project-listing as given in the "My Projects" section, and generates tiles in sequence. If so, then this new feature might be incorporated into that iteration: it might, perhaps, force a new tile-row (for the header), add the header, and then force another new tile-row (for the following items).

Notes:
I did realise just today that this can somewhat be done by adding one's own items to custom collections, and then displaying those on one's page instead of the items themselves. However, that feels somewhat clunky, and results in the item-tiles becoming rather smaller, which is not ideal. Further, it doesn't allow for images to be used as section-headers, reducing the potential for theming one's page.