If you have 200% can, there are a lot of ideas, many things for home from Armani Casa, Gucci candles or gift cards, you can even buy a pen from Tiffany & Co, ask you BF about what does his mother like, it could be some special sort of coffee or wine or many other things but you should know for sure. Buy something useful. An accessory for mobile phone is not a bad idea also my mother loves them.