I dealt a death blow to my carpet monster back in April. My dropped parts always seemed to head toward the heater duct and fall in. Back in April I was walking thru Wally World and was in the isle with the throw rugs. I saw a 4.5ft by 6ft cream colored rug that was extremely soft, had a short pile that stands up. So I bought it, put it under my hobby desk, checked to make sure my chair rolled smoothly and then I picked up some small parts from my greeblie box. I dropped them, threw them, tried to flick them with my fingers but the carpet is so soft that anything falling on it is stopped instantly. But that's not a real world test so that night I was building and dropped a small part. It was a Dragon kit so it was that light grey color that they use. I could see the part clearly and it had hit the carpet and stopped. Pretty easy to retrieve the part and continue sticking parts together. So the past few months I've dropped parts, all sizes, any color, plastic, resin and photo etch and haven't lost one. It catches small tools also. Drill bits and needles are caught and quickly recovered.
Before I'd be crawling around with my flash light looking for a part or shadow or glint of metal only to find dust. This was one of those impulse buys, cost about the same as a cutting pad and is just as indispensable.