Its funny you mention this. While I dont think that starbucks cups are sturdy enough to use as pots, I have started using large, thick plastic bins from Costco as pots. I tried this technique to hang my 2 Phals (first 3 photos). I just cut a portion of the bottom out, cut some slits on the side for airflow, jammed the Phal in the bottom and put spag in the top. Voila! Hanging Phals.
The last picture is one of those big clear bins that the Costco pretzel come in. I think when I have to repot a large Stanhopea, its gonna go in there with the same cutting technique for the pot as the Phals. The Stans will go on top though and the flowers will come out the bottom. We shall see!