For my parents' 25th anniversary I wrapped up my newborn daughter in a shawl and then Bacofoil :-D (We were soo strapped for cash lol)
But for you I think that would be above and beyond the call of duty ;)
I also don't like ornaments,
I was given a Silver-plated Carriage Clock for my 25th Wedding Anniversary, it has pride of place on my mantelpiece :)
You would have loads of choice as regards price too ;)
Just a selection on amazon
Carriage ClocksAnd there are loads on ebay - sitting on my hands now :-p