splendid to buy so many flowers as the reasons you have, then write down all the reasons on nice cards, using a card for every reason and attach them to flowers. So, you will have unusual bunch of flowers, where every flower is very pleasant in itself, containing special message for your mom. Additionally bake a cake and with the help of cream write something like "for the best mom in the world"! I dare say your mom will be really excited about such present for Mother's day! Good luck!