i'll start:
- Ryu* - Mind Mapping [Map] /s/59011
-> very elaborate storyboard and way of showing hitsounds (literally)

- Imogen Heap - Headlock [Larto's Locked] /s/5257
-> has a freeze frame for a circle before you can click on it that fits the music

- Masayoshi Minoshima feat. nomico - Dream War [War] /s/1663701
-> super cool repeating patterns which feel like flowers

- Obsidia ft. CoMa - Beautiful [Tell Me Something] /s/642796
-> has a spinner section which perfectly match the wubs

here's some examples, now's your turn :p

- daniwellP - Testes broadcast.proj /s/47087
-> has an inovative way of using the storyboard and video at the same time

- TAG underground - POSSESSION /s/746991
-> play with custom skin and bg dim on 0%, this will be quite the experience

- Megurine Luka - DYE /s/12903
-> same thing here (though you don't need the skin on), this will be quite the experience too o.o

- Five Hammer - FFFFF [Sico's Insane] /s/18189
-> this map feels really ahead of its time with some of the patterning to represent the song, and it's someone with only one ranked mapset

hope to see more cool stuff from people :p