To add a sentiment you just need to punch out the shape and keep the punched out piece to mark push through the aperture when your top layer is in place. Remove the top layer leaving the punched shape in place. Draw around it so that you know the limits of your stamping. Here I used the incredibly flexible Crazy About You stamp set which is lots of words that you can put together to build your own message.
A knot of silver ribbon just adds a touch....... and you're away. It's also flat for posting YAY!!!!
Why don't you have a go with other papers you have and maybe use up scraps that you can bear to throw away, but feel you should move them on! Of course you could try with any other punch to build a patchwork with a different shape.
In fact why not take a look at the triangle punch in this week's weekly deals and make a three sided patchwork!
I'd love to see what you create, so please do share you designs by sending me a picture to firstname.lastname@example.org and I'll share them here.