small pond plants (Swindon SN5)

We have recently created a small pond for my two nieces.

At the moment it only has water, but we are planning on adding gravel and some large rocks/pebbles.

Does anyone have a few small pond plants they can spare? Not sure what varieties would be best suited to a small pond.

We dont intend to have any fish, it's purely to see what beautiful wildlife we can attract.

Any advice would be gratefully received.

Many thanks, Trudy