This may sound silly, but it was very much appreciated by my parents on their golden wedding. A newspaper printed on the day of her birth !! Several sites available, just Google them. Mine came with a certificate showing what things cost, who else was born that day etc.
Continuing the photo theme, various sites (such as Truprint) do memory books, where you upload pictures that they then put into a special book for you.
I've just posted to the question about the 30th birthday about my friends site www.saysomethingspecial.co.uk you can do an online classified announcement simular to what you see in the back of papers its only a little gift but your Mum could keep the print out forever.