You can obviously use any 12x12 paper pad or indeed a 6 x 6.
You can use up what you have and any scraps.
If you don't have an paper pads lots of shops sell them, the range, the works, hobbycraft, ebay & amazon etc...
I used a paper trimmer from amazon and the double sided tape can be purchased from the stores mentioned above.
Magical mini envelopes - /watch/02RZDQUPwEQPZ
thanks for watching