Balsa wood is the EASIEST thing in the world to work with. It's super easy to cut, too.
I bought a length of 4" balsa wood. I think it was 36" long.
I used an X-acto knife to cut through the balsa wood to make each postcard 4" x 6". It's super soft and I tried not to make them too perfect as you can see. Then I used a piece of sandpaper to smooth out the edges.
I painted them with white acrylic paint and then sanded them a little more to give a "shabby" look. With a black marker we wrote the words. Here is a picture of my sister working on one of the postcards.
The other side of the postcard? "Love you to the moon and back" and a place to put the address...
I think they could benefit from a clear coat spray of some kind. I didn't do that with mine but I'm working late and need to get these in the mail!!
Making this heart with the tiny dots around it - fun!
Best wishes for a lovely Valentine's Day with your Valentines.