Collect your brown creature photos for the Genshin Impact Five Flushes of Fortune event in Stormterror's Lair or the Thousands Winds Temple.
Brown creatures are all over Genshin Impact, so this Five Flushes of Fortune topic ranks among the easiest to complete. Regular Hilichurls, Mitachurls, Geo Slimes, and Rune Guards are all brown, and one area in particular has all four in abundance. Stormterror's lair in northern Mondstadt is full of regular Hilichurls, and there are small camps next to each of the three checkpoints. If you're feeling nervous, you can find Rune Guards in the southern part of Stormterror's Lair, although you can safely use the zoom feature on the Kurious Kamera to capture photos of these deadly enemies from Genshin Impact.
In Stormterror's Lair, simply look for the wooden platforms covered in torn cloth to locate the Hilichurl camps. There will be a mix of regular and elemental Hilichurls in these camps, but you shouldn't have a problem finding ten regular Hilichurls for your Brown Creature Five Flushes of Fortune requirement. If you want a slightly slower route with fewer Elemental Hilichurls (and Runeguards), head to the Temple of the Thousand Winds in eastern Mondstadt, where regular Hilichurls are more commonly found than their elemental peers. There aren't as many Hilichurls here as they are in Stormterror's Lair, but they tend to congregate around the waypoint, so you won't have to go far to take those photos with the Kurious Kamera.
Return to Ji Tong in Liyue Harbor once you've collected all ten photos of brown creatures to collect a treasure trove of rewards (assuming you have at least one of each of the five colors). With the Five Flushes of Fortune event coming to an end, you'll want to hit your Genshin Impact friends for one of their duplicates if you run out of snatching all eight rewards.