Both blocks use half-square triangles (HSTs). The pink and green block on the right is a variation of flying geese made with HSTs. You can find the tutorial here from Jeni at In Color Order. If you'd like to use HSTs to make a zigzag block (the pink block on the left), you can find that tutorial here from The Sometimes Crafter.
Feel free to use the tutorials as a guide and alter them if you wish. I am overrun with 5 inch charm squares from participating in numerous swaps so I'll probably end up using those instead of 4 inch squares. Post pictures of your blocks in our flickr group and be sure to bring them to the July meeting!
