Depending on your needs, if the roAppManager customization isn't sufficient, an
roImageCanvas may do what you want. It allows you to customize backgrounds, colors, logos, use different text fonts, colors and sizes, etc. It even supports standard Roku buttons (although the documentation for the button events happens to be missing, but they work the same as other buttons). It's not too difficult, although definitely takes more code than an roParagraph screen, depending on how much customization you plan to implement.