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we thought about a cuckoo clock - by pooling with my sister in laws, but they don't want to (they are quite well off!).
Anyway, they now live in a flat and used to have a lovely garden. We have found a nice clock that has twelve birds on, around the numbers. On the hour, a different birdsong is played! It sounds naff but someone at work has it and they say it's lovely so I think they'll like it.
Also, i have ordered a crystal rainbow maker, from the children.
I couldn't really think of anything blue, and there decor isn't blue anyway. Mum loves her pots and glassware and enjoys buying her own.Thanks everyone for your help. x