What should a bridesmaid get a bride for her bridal shower?

there are 2 bridesmaid in the wedding my 16 and my sis 13 and when were have gone to bridal showers in the past the bridesmaid usually give the bride a big gift. but since its just the 2 of us and we are young we don't know what do give. any creative ideas? or should we just stick to the registery
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