I would be interested to know why you don't like them? Is there something inherently wrong with them?

If it is looks, then have a gander at these custom made fenders for Bromptons. http://www.ecovelo.info/2011/01/13/nisnas-cycles/
If it is they are not sturdy enough, have a look at this device http://www.milianparts.com/en/products/plablo/

Maybe you need longer flaps on the fenders. Brooks makes some beautiful but expensive ones.