Gifted old items we both don't want

You might be able to modify some (the cake cutter and the glasses) for your taste but I agree with PP tell you already have selected.

You can't unfortunately

I agree that as they are now, they do not fit the look you are going for but they aren't a complete loss either. You could so easily re-do them to make them work for you. Take off those ribbon/flower things and hot glue some hibiscus flowers or some other tropical flower on them. Same for the flutes. The garters can be changed up with new flowers and ribbon and use one of them for the garter toss. The pillow, add some flowers, ribbon, leaves etc to it. However, if you just don't want to use any of it regardless, I would just donate it. She probably won't even notice and if she does, just say how much you appreciated them but they just didn't fit the vision you both had for your wedding day.

P.S. WW doesn't allow deleting, you are stuck in the WW world forever! lol