I just found out about Papercraft Star and can't wait to play along with them! Here is what they have to say about their site:
"Papercraft Star is a challenge blog that presents paper crafters of all skill levels with new challenges each week. Upon entering your project in the challenge the public is provided with an opportunity to vote on all projects entered for that challenge. At the close of the challenge the top vote getter will receive a Papercraft Star button and often valuable sponsor prizes.
Once per month we will also randomly draw a Grand Prize winner from all the participants of the challenges during that month (the more times you enter the challenges during the month, the more chances you have to win!) The winner will receive fabulous prizes from our sponsors"