Gift ideas for parents of the bride?

[BabiesOnTheBrain1]

As the title says really, I need some ideas for gifts to give my parents on the wedding day?
They've both been massively helpful, and made a very generous financial contribution for us to spend as we pleased, no strings attached. So we would like to show our appreciation I had thought flowers but now in two minds..

I got m mum a huge bunch of flowers from my most favourite florist in the whole world (she did the church flowers too but a friend offered to do the reception ones). She also had a Betty's afternoon tea voucher in them as a bit of an extra. I still feel like I should have given more to her but I couldn't think!!

Dad got an engraved pocket watch (which I managed to forget to give him on the day haha!)

We bought olive trees for the parents. They came wrapped and ribboned and have actually produced olives!

I commissioned an artist to paint a botanical sketch of some of the flowers from my bouquet for my mum. She loved it (and it really wasn't expensive!!)

We announced during the speech that their first grandkid was on the way!

A posh hamper with cheese, crackers, chutney etc, plus a bottle of a decent wine. Not too expensive and easy to do and can be personalised to their tastes. Can give with flowers as well.

A short break somewhere they like or wish to visit. They will be stressed and tired assisting with arrangements and making sure things go well for you.

Some great suggestions there, thank you all!
NapQueen that's fab! I would have loved that but unfortunately it hasn't happened for us yet to be able to do that I'm hoping that could be their Christmas gift!

@justtheonethen Olive trees are a fab idea. If you don't mind my asking, where did you buy them from? Might see if I can buy some for my parents when I'm in London

Maybe a lovely childhood photo of the three of you, in a silver frame?