I'm sure this has been done before, but here's my attempts at making an infinite room generator. Both have their problems, but they also both work fairly well. (The maze may look like an adventure map, but it's quite a ways from being one.)
The rooms required very few command blocks to get up and running, so I thought I'd try something a bit bigger and try and get rid of the pressure plates in the process. It ended up being much harder to create a random maze (instead of open rooms) which also ended up slowing the generation down. (I know a couple of ways to speed things up, but it would take more time than I was willing to spend on it right now.)
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The rooms required very few command blocks to get up and running, so I thought I'd try something a bit bigger and try and get rid of the pressure plates in the process. It ended up being much harder to create a random maze (instead of open rooms) which also ended up slowing the generation down. (I know a couple of ways to speed things up, but it would take more time than I was willing to spend on it right now.)
Infinite Rooms that generate fast enough to run across
A screenshot after running around a little.
An infinite maze to explore
Sorry, there's not much to see. It's a maze of twisty little passages, all alike. There are a few monsters somewhere though.