I used this tutorial:http://www.thenester.com/2010/11/making-a-coffee-filter-wreath-and-tree-and-things-of-that-nature.html
Unfortunately, I didn't have enough coffee filters and my wreath wasn't nearly as full as I had intended it to be.
From the street, it looks fine though! Also if you cross your eyes when looking at it up close, it looks much more full. ; )
The picture frame idea came from this tutorial: http://daniellebartran.blogspot.com/2011/01/valentines-decor-things-i-really-want.html
The best part was, I didn't even have to glitter my heart. Hobby Lobby had them for $1!
I was forced to glue polka dot tissue paper around the sides since I ran out of coffee filters, but I thought it turned out pretty cute.
The polka dot flower was just rolled up scrapbook paper. There are tutorials for those flowers everywhere.
I hope this gives you some inspiration for your own Valentine's wreath!