I chose an ocean themed level
Here's some sources for a level about an underwater cave that I could make
Source 1: Nautical Nightmare (GD Inspo)
108861000
Lots of undersea creatures and underwater-style deco that I can draw from, with different utilization of gd objects to make an deep ocean environment
Source 2: Irl
Recently went caving, images as reference :)
This is more of the cave vibe rather than just underwater
Source 3: Subnautica
I have watched a lot of footage from this game (and if I was finding inspo for an actual level) and would probably get it and explore the environment and the different creatures :)
Source 4: hypnotic tide
Another great gd level with lots of atmosphere and a very cool jellyfish design