Little Kids:
Chalk, Jumbo Crayons, Coloring books, stickers, X-Mas Decoration

Adults:
Flavored Oil (bought DP garlic infused Oil for his b'day)
Photos - last yr each grandparent got one of those mini albums full of pics of DD, we also made Photobooks for people like BG said.
X-Mas Decoration, handmade or otherwise
If you have kids sometimes finger paintings or drawings put into a frame are great gifts.

I love the idea of seedlings etc

I can never help myself at x-mas so will be watching this thread for some great ideas!