Yes, I used to have this in my setup. I used a rope light around the metal frame, then I masked on top of the light to block directly seeing it. For lower contrast pjs, this is a quick and viable low-cost fix. But you must mask the direct light for the full effect.
You don't want to put the rope directly behind the screen material, however, unless it's 100% opaque. My old Dalite cheapy screen showed even the slightest hint of light from behind. REALLY annoying.