I made these Strategem Markers a while ago, after CoD first came out. With the Importence of Objectives in 5th...they naturally became two of my objective markers for my Eldar force.
#1) Extra Ammo, or one of the Tunnel Exits. Made from a left over Falcon hatch, spare from the wave serpent converstion.
#2) Beacon / Sensor. Made from scrap falcon parts, and a shiled from an old Mekton Mini.
That's all I have done for now.