I try to give the girls a new 'word of the day' every morning:
A month ago, the girls' grandmother brought them a calendar with pictures that children drew about marine conservation. They love to point to the pelican and tell me that he's sad because there is trash in the water. We put a sticker on every day, sing the days of the week, talk about yesterday/today/tomorrow. The girls are really getting it. The other day, Barney (the Dinosaur) started singing the days of the week song, and E said "Mommy, look!" and pointed to our calendar.
We have a number of activity books for cutting & pasting, connect-the-dots, mazes, find-the-difference, etc.. which we try to do at least one of every day. To add a little math-twist to the pasting activity (since I'm a math-geek), I labeled the pieces and their locations with numbers so the girls could match them up:
The girls' grandfather (my dad) brought them a crystal garden. You can see the crystals grow throughout the course of the day - almost right before your eyes. I'm not sure the girls quite got a science lesson from it, but it was very cool to watch:
Finally, I wanted to share how creative the girls are. Here is E making drums out of things in her junk drawer (the 'junk drawer' which has all the random objects I collect for the girls to play with is a constant source of entertainment throughout the day).
I'm not all that excited about having my kids play with dog-food, but who am I to stifle their creativity?