Hi shazbang,
Ooops sorry, ...
Had an idea,
How about a painting of her (or both of you).
Check out your local Art Colleges and find someone who's style of art appeals (modern/traditional/impressionism etc)
It could be pastels, oils, pen and ink........
You could do it on the 'quiet' by providing them with photos, and suggest your own background, (me thinking glaciers).
Don't mean to sound a 'party-pooper' but I wouldn't really appreciate a star or dolphin........... all said and done, it's only a piece of paper that will get shoved in a door after a while!
Unless your local zoo has a sponsorship scheme, that way you can go and visit your animal and see where your money has gone.
Ideally you want something to last forever, so something tangeable like jewellery, art, keepsake, glass etc.
Just had another 'good idea'!!! (god I'm brilliant tonight)
How about a rough diamond?
They just look like a dirty bit of ice.................
........... but it could come with the promise that for say, 10th wedding anniversary it could be cut and set into whatever she wants!
Will keep giving this thought.................
.............. love present shopping!
Please let me know when you've decided though.