As discussed in the previous section, the inability to share colormaps with the window manager's border decoration makes it visually unappealing to create window manager decorated windows in the overlay plans. This problem could be solved if a convention was established where window managers would make available (probably through a property on the root window) the colormap the window manager intended to use for overlay border decorations. Such a convention might be part of a future revision to the Inter Client Communication Conventions Manual (ICCCM). Effectively, a default colormap for the overlay planes would be established. Multiple overlay windows could share the window manager's overlay colormap to avoid colormap flashing the same way the default colormap achieves this end for the default visual.