Funny thing. I was just going to add squeezing opportunities in the "White Wyrms" encounter in the War of the Burning Sky Adventure "The Scouring of Gate Pass." It takes place in a very large warehouse, where there's islands of bunched-up boxes & crates. I was going to add some thin passage channels through these island of inventory where people can squeeze through if they want.
There was a great opportunity to include some squeezing opportunities in the H1 Keep of the Shadowfell adventure; in the Kruthik Lair where the kruthiks have burrowed narrow tunnels through the solid walls separating different parts of the area. But instead they have it so the kruthiks can move through these openings at full speed, but PCs cannot move through the tunnels at all. In the free download for the adventure, they have at least added that small PCs can squeeze through the tunnels. But when I ran the adventure the first time, I provided the option for PCs to squeeze through with a successful DC 10 Acrobatics checks, and the same check for a small character to move through the tunnels with no squeeze penalty.
You know, I like 4th ed and I prefer it to 3e, but I hate this new design principle to provide terrain that the opponents can use greatly and PCs can't use at all. And I don't mean things that just make sense, such as fighting amphibious creatures in an area covered by two feet of water. But these contrived situations which would be a great opportunity for PCs to be able to take advantage of their skills, or a wacky magic item, or by using a power in a new way, and instead they're just shut down completely. No DC to shoot for. Not even a hard one. For example, declaring that PCs simply can't swim in two feet of water, whereas lizard folk can swim and hide in it just fine.
Okay. Rant over. How about more squeezing scenarios? They're pretty easy to include in natural caverns. And, of course, for scenarios involving hunting small opponents in their lair.