There is an esteemed history to blobs, though I would like to say that they were most prevalent in the atomic age of domestic appliances, they have continued to make an appearance over the decades. I did raise a slightly inebriated eyebrow when GM Jon mentioned that the crew of the USS Lexington had just encountered one, though Dave also remarked on a punishing battle with the bell curve last week as I believe most of their evening was spent making appalling rolls. Personally I can find it a struggle when an entire party repeatedly rolls badly as other than NPCs either doing a tap dance to pass the time whilst the party slap themselves out of their collective hypnosis or allowing my monsters to merrily chomp away at protagonists, I'm never quite sure what to do.
Interestingly the early 'blobs' typified unfathomable and frightening entities, their physical form directly representing the barrier between the world we know and something completely alien. They also have the advantage of being relatively easy projects as far as special effects are concerned.
In more latter day scenarios there is a nod to the heritage I believe where things like gelatinous cubes are concerned but as Science Fiction matured the genre it has given way to more descriptive creatures and plot devices and to even more sophisticated, albeit malevolent, entities.
Problem is of course, where do you put the badge on a blob ?