One of the coolest ways Wendy Vecchi has been using her new Thank You Bouquet Bundle Stencils from Spellbinders is stenciling them on that perforated paper you can use for needlework. The question that raises is: HOW do you attach such a panel to your card? Of course you can use spray mount or any other invisible adhesive; or you can add a couple of diecuts on top of the design and hide a visible adhesive behind them. But... you can also "show your work" as they used to say in math class, and here are a couple of ideas for doing that:
Idea #1: Brads! I've added three
Eyelet Outlet Dragonfly Brads, pretty evenly spaced, towards the center of this panel. I placed my stenciled flower panel on top of the pale blue mat, secured it very lightly with low-tack tape at the corners, then pierced holes through the holes of the perforated paper, threaded the brads through and opened the prongs at the back. Job done. Secure your thread ends at the back of the cardstock panel with tape.
Idea #2: Stitches! Perforated paper was literally designed to be used for stitching, and if you happen to have some laying around, chances are you have some embroidery floss, too. This time I didn't need to secure the corners because I had my brads in place, but if stitches are going to be your only attachment, you will want to keep the panel from wiggling while you pierce your holes.
Bonus Tip: How to pierce holes for stitching or brads if you don't have a paper piercer: A push pin is absolutely perfect for this, and you almost certainly already have one somewhere in your home or office. Pointed tweezers also work. Spellbinders' Tool n One (more commonly used for poking diecuts out of intricate dies) is good, as well. I actually have an ancient Heidi Swap Paper Piercer and I use it ALOT atop a piece of an old mouse mat that I saved especially, but any piece of semi-stiff foam or an old padded envelope works well to put underneath.
(Just FYI: Yes, you really do need to pierce holes; a needle or the brads' prongs will probably not be able to go through your backing cardstock without bending or marring it. Ask me how I know!!!)

A few other ideas that I haven't shown here: Staples, either regular or decorative (
especially cool with a grunge aesthetic); Eyelets; Machine stitching; and possibly...
I haven't tested this but I suspect it will work... A wax seal applied on top of your design? Experiment and have fun!