Our alphabet binder was a present from our little friend Luna. (Isn't that a sweet idea for a gift?) It's been perfect for collecting collage pictures, including this sweet little house. And such great practice for beginning letter sounds and letter recognition.
It's a fun activity to share with other little friends too! Just be warned, once you start a file of this sort you start to find material everywhere. Especially if you have a destructive little baby boy around with a penchant for books. (Ahem)
Extension activity: For older artists, you might consider a larger alphabet file to keep reference materials in. These can be pictures for sketching and tracing purposes, as well as other artifacts that inspire them. Yes, there're always Pinterest, but it's good practice, I think, to still learn to file things the old-fashioned way too (wink).