For all those years that your mother has to put up with your shit, she deserves an unforgettable gift like no others. Remember the times when she had to change your diapers? Of course you don't, because you're an ungrateful child. Now that we reminded you, it's still not too late to do something about it.
Mothers love to see their babies all grown up, yet they still love to reminisce about the good old times. Tell her you are an adult now and this will be the last time she has to put with your shit. Forget about the flashy jewelry and fancy dinners. Hand her the box of chocolate poop and watch nostalgia do its thing. She'll be so proud of you and this will truly be a gift she'll never forget.