I need to create a "Birthday Reminder" poster...?

I want to make or create on the computer a large poster to be framed and hung on the wall...I want it to have an area for each month and maybe a background or theme for each month and with each month I want to list all my friends and families birthdays. This is for a gift for my "forgetful" sister. Any suggestions? Should I create this on my own?? Or do you know of any place online or something I could give them the info to make? If I need to do it myself, any ideas on what omputer programs to use??? Please help!! Thanks!!