Try this:
A1 = TODAY()-DAY(TODAY())+1
case 1: you want only the month displayed
A2 = IF(MOD((MONTH($A$1)+ROW()-1), 12)=0,12,MOD((MONTH($A$1)+ROW()-1), 12))
Drag down as needed
From A2 down, the cells should be formatted as numbers
case 2: you want the first day of next month displayed
A2 = DATE(YEAR(A1),MONTH(A1)+1,DAY(A1))
Drag down as needed
Dan
P.S. xlhelp: using EOMONTH function causes an #Name error. Is it a user defined one?