I noticed that, while most starting points/elevator rooms/key rooms are plain and have nothing except a spawn point and arsenal station/key and key stand/elevator, some are more interesting -

I saw a few starting points that have spikes blocking the way out of the spawn room and some crystals. One of the crystals has a button to lower the spikes.

I once found a key room that had the key surrounded by spikes, and some crystals - One of the crystals has a button to lower the spikes.

Twice, I found an elevator room where the elevator was surrounded by breakable blocks/stone blocks.

I would like it if the chances of these room versions appearing were increased.