anneversary present? it's for my parents so nothing disgusting lolz!?

okay soo my parent's anniversary is comming up on sunday (it'll be there 6th) and i was wondering what i should get them. now there are some rules.

1.) NOTHING SEXUAL they are my parents

2.) please don't make it cost to much i'm on a budget here :)

and the hardest one of all:

3.)limit the use of pictures, here is why. my grandma got my parents a five by seven picture of themselves and told me. i immedently said omg i should do a collage. my grandma like glared at me the whole time and i think its because she thinks i'm copping her idea. PLUS she's getting the a gift certificate to my mom and dad's favorite resturant!! i know this is a challenge but i've asked many questions on here before and you have never let me down!! WOOT WOOT.

oh by the way my two ideas were

1.) collage (this was my best idea but idk if i'm still gonna do it)

2.) a picture book of there life together (it's gonna be hard so this idea i'll only do if you people can't think of anything else! plus i'm an awful artist lol)