It's called a star burst card.
I am running a Christmas card class this Friday from 10.30am at Claus Manor, Wyoming.
I CASED (copy and share everything) this idea from page 110 of the stampin' up! annual catalogue.
Modified somewhat to make it easy to make in mass numbers. We will be using this new stampset "Wishing You".
The patterned paper is from the Seasonal catalogue " Winter Frost" paper stack ($11.95 for 48 double sided card-front-sized sheets.)
Call or SMS me on 0468877125 if you would like to come.