I love to make them using red packets as it comes with different colours and designs. Alternatively, you can also use origami papers. Sizes of your Fortune God varies with the size of your paper. I used the standard size red packet and it fits SGD$1 coin perfectly.
I made five little fortune god and it is our 五路财神 as we welcome the Year of the Monkey.
If you are interested to make your own little fortune god, check out the video on the following link : https://www.youtube.com/watch?v=XRVaGl3k9G4. All you need is a pair of scissors, some red packets/origami paper and coins!