Portal Video Game Birthday Party! Have you played Portal or Portal 2? They are big hits in my family...so we did a combined birthday party for my brother and son. Portal themed. I must confess, I haven't played the game. I like video games...but I like crafting geekery more. I used block posters (it's free) to make a big GladOS picture of a drawing I just took off the internet...so don't copy me! Hung it on the wall with painters tape. My printer is out of ink, so the ink was light green. I outlined the entire thing with black sharpie markers. We made some Aperture Science motivational posters, because we can. Complete with Cave Johnson. For the backdrop, I cut 2 inch strips of plastic table cloths... And we pulled them gently...down both edges... to look puffy, like propulsion, repulsion and compulsion gel! And hung them with command hooks. Just used silhouettes of the portals and mounted them on cardst...