iimr.com is an excellent quad premium domain name with double repeating letters.
IIMR.com also has lots of acronyms.

DesignAnt is higly brandable name.
Suitable for web / graphic design agencies or free lancers.

YDFO.COM is a short brandable 4 letter domain name
DFO - Direct Factory Outlet

lmze.com is a short triple premium domain name.