What in the world did grandmas do before Pinterest? I'd be half the grandma I am — at least in terms of the eats and activities I share with my grandsons — if not for the food and fun pinned and promoted by folks far more crafty then me.

Take for instance the super simple puzzle fun I shared with my dino-loving middle grandson, Mac. Without my stumbling upon a Pinterest pin leading to this post by a clever mama, Mac would have never had the opportunity to see how a few circles, triangles, and squares can be pieced together to create his favorite creature.

Now, I surely could simply say: Check out that post cuz it's perty darn cool. But then I'd have to come up with a post of some other sort to fill this space today. More importantly, though, I'd have no reason to share the photos of Mac making his dinos, photos that prove how Pinterest-worthy this quick, easy, and inexpensive activity actually is.

With that in mind, here are pics of the day Mac and I created the clever, captivating cutouts during my desert visit in April.

What you need:

• 1 sheet of craft foam (green...