This design is totally lifted from Amy Keller's blog (a CTMH sistah). Amy, you are very talented! Go check hers out, as she did cards to match and the whole set is awesome!
Edited to add: A while after I posted my post, Amy posted her simpler (than mine) instructions on her blog. You can find Amy's instructions to create her Magazine File Card Holder here.
There was no template for the holder at the time I made mine, so I created this as I went. I filled it with 8 miscellaneous 4 1/4 x 5 1/2" cards and envelopes. (Might have to do a matching set to go with this.) I'm not sure how Amy did hers. I'm sure there is probably a better way than the way I did it... LOL. Anyways, I hope you like it as much as I like hers!
What I used (all CTMH unless otherwise noted):
Perfect Day B&T
Silhouette B&T (butterfly)
White & Black C/S
Black and Juniper inks
Classmate Alpha stamp set
Solo E stamp set
1 1/4", 1 1/2" punches
Butterfly punch (Martha Stewart)
Scallop edge punch (SU)