I just used photo sleeves I already had- and they already had two holes punched in the top of each.

 Next, I cut the colored paper to fit inside the photo sleeve.

 I used this website to print these letters.

I clicked on the link that says "Name and Sentence Print Worksheets".

You kind of have to mess around with the scale when you print them, so they print to the right size.

After they were all printed, I cut them out to the sizes I needed them.

 Next, I glued each letter and number onto a piece of the colored paper I already cut.

 I then slipped each card into a photo sleeve.

 Tada!

Porter already loves it. He gets a little frustrated and I have to hold his hand and help him trace, but hopefully over time he'll get the hang of holding the marker correctly and be able to do it himself!