The 90's was all about drop D tuning, obviously, no news there.
I think the trend of songs in E where there is no 3rd, and the B and high E string drone through all the chords has become a signature sound of today.
--E(no3)---Bsus/E------A2---------C#m-----CMAJ7
E---0---------0---------0-----------0---------0
B---0---------0---------0-----------0---------0
G---9---------8---------6-----------6---------5
D---9---------9---------7-----------6---------5
A---7---------7---------0-----------4---------3
E---0---------0---------X-----------X---------X
I can think of songs by Jars of clay, Sixpence None the Richer, Delerious, Goo Goo Dolls, and more that use this.