I found the mint paper at Hobby Lobby, dark coral at HEB, silver with a grey back at Walgreens, and white you can find anywhere :)
Don't buy stuff that's too cheap or it will rip too easily! Since I'm hanging mine up against a brick wall I only used 8 sheets per flower. It is actually pretty hard to cut through several layers of tissue paper so this madey job a little easier too!
Make sure you follow the tutorial and use 13x20 (within an inch is close enough) sheets. I had to cut mine to that size. Also be sure to fold correctly... I had a blonde moment and folded the wrong way and it did not work out. Oops! Here are a few progress pictures but seriously, use someone else's tutorial. It's much better than mine ;)





















