Select the item that contains the dash or stripe you want to recolor.

For a frame, choose Item > Frame (Cmd-B/Ctrl-B). For a line, choose Item > Modify, then click the Line tab. For a paragraph rule, go to Style > Rules (Cmd-Shift-N/Ctrl-Shift-N).

In the Frame, Line, or Rules pane:

Choose a Color and Shade –.

Figure 2. This is a dashed frame with a 15% Black Gap color.

Figure 3. To polish it off, we added inner and outer frames in separate text boxes, both with a background color of None.

Figure 4. Light Line color, dark Gap color

Figure 5. Dark Line color, light Gap color

and/or

Choose a Gap: Color and Shade (this is not available for a paragraph rule).