What are good anniversary gifts to get for parents?

A handmade portrait would be a nice present for them. Please take a look at http://www.paintyourlife.com
They have wonderful gift ideas for every occasion. The choice is big – e.g. oil, pencil, charcoal or canvas portraits. They are also fairly priced, and you can instruct them to send the portrait directly to the person you want!
They also do wonderful photo-printing on canvas in different designs. Please take a look at http://www.photo-print-on-canvas.com for more information.