1,
colored grid
use js script to create random color grid:
http://lukeroberts.us/2010/01/create-a-randomly-coloured-grid-in-illustrator/
js site: Vary_hues :http://wundes.com/JS4AI/
2,
round corners
http://www.dreaminfinity.com/nocturne/tutorials/illustrator-tutorials/rounded-corners/