Make a collage of pictures of your mother's memorable days like her wedding day, graduation day, first day at work, etc and gift her a giant frame
If you know baking, then surprise her with her favourite cake. Bake her favourite cake and cut the cake together to celebrate the day
The best thing that you can give your mother is your time Take her on a date and spend some quality time with her
Gift a customized jewelry piece to your mother and make her feel special
Gift a personalized coffee mug to your mother on mother's Day