There are many cards to download and print - here are some I found:
A bunting card
A lovely vintage inspired card
A stylish "put a bird on it" card
Ours are little more tactile...lots of pasting...here's how we did it.
We made two styles - a stand up person and a person on a card.
The template for the person is from here. If you want your card to stand up, I would suggest you make the fold back a bit bigger. All that glue and hair makes them a little top heavy.
I downloaded the image and made a page of them in Adobe illustrator then I printed the templates on cardboard.
For my kids, I pre-cut the people out because they are too young for that.
I printed a page of the the word "thankyou" on some transparency paper but I it could have just as easily been done on coloured card or white paper.
We "dressed our person first". I used some left over print outs from the magnetic paper dolls I made before Christmas.
We also just cut shapes in felt and coloured paper. The kids love round circles for puffed sleeves and silver pipe cleaner tiaras for the ballerinas. We used a hole punch to make circle eyes but I did convince them to just draw some of the faces.
Now off to the post office!!!