If you're having trouble finding some of the components for this project, you can purchase them as a kit from my store (six colors available).
Check this project out on Make: Projects!
Step 1: Materials and Tools
wooden embroidery hoop
switch or snap
sewable battery holder
If you want to get the high quality frog template design, you may download it for free here:
Step 2: Prep work and standard embroidery
Step 3: Prepare the LEDs
If you're using a standard toggle switch, now would be a good time to solder on some leads and coil the ends. If you're using a snap, just move along.