I made a simple beacon for the top. I took an unused section of the blue card, and cut a small circle... I used mu Exacto handle as the pattern, then pressed it into a moues pad to create the cup shape, then just rolled white card around a paintbrush handle to get the right diameter, and glued the cap on it.
I then cut some thin strips of the blue color, and glued them on to make the cage of the beacon, and glued it to the top.
Also in this pic, you will notice I've started adding the greebelie pieces on...