Here's an advanced trick, if you want different dice:
in cell A1, put the die type you want.
copy the following formula down the rest of the sheet:
"=INT(RAND()*$A$1)+1"
Now, if you want to change the die type, you just have to enter a new number in cell A1 and refresh the sheet. You can even make multiple columns and they'll still use the contents in the A1 cell.