If you were to use dungeon tiles to create/build a dungeon, how big do you want the tiles to be? My current crypt set uses 3 sq x 3 sq (210px on each side), which allows for a lot of creativity and flexibility, but can take a long time to do if you are building a large dungeon and makes it difficult to throw together something on the fly. The other option is to make much larger tiles... going up to 8x8 or larger, but this reduces variation and flexibility. in exchange for ease of use and speed.
Attached below are four examples of the crypt style dungeon tiles I've made and a larger example of a crypt made using the tiles. So you can see how flexible the smaller tiles are, but building a dungeon on the fly would be out of the question unless you're really, really fast.
So again, what size dungeon tiles do you prefer or would you like a mix of the two? Individual tiles that are parts of a whole or entire rooms on one tile that you can mix and match to build a dungeon quickly?