So, today's aesthetic is Acid Pixie: it's an aesthetic focusing on hallucinations caused by LSD or similar drugs. Its visuals have mostly neon colours, and it shows pictures of either nature, or satanic symbols such as horns and pentagrams. Now, for the fashion, there isn't a definite style, but neon make-up and/or neon clothes can fit pretty well!!
Note: if you decide to change your background to something creepy... Don't do it at night!! I changed my lock screen to some dude smiling, and then I remember that the phone opened slowly... And then I saw the photo!! I felt physically terrified!!