There was a giant swarm of cicadas, and i recorded them. You can hear the individual ones that are close in the background of millions of ones in the distance.
Hitting a wooden desk with fist. Recorded with xperia phone, and then denoised, normalised. These are dry samples with no effects, so you can process them to your liking.
I created this sound with audacity. Not quite sure what it is, but i guess you can use it as a loading screen background music in a game, if you want to.