Below is the second rug from this design that Deb is doing and I'm loving the colors she chose. She said she enlarged hers to 15" x 30". Mine will probably be about those dimensions too when I finish my other projects. The Santa and Deer will be done real soon, then want to work on the 500 Mile Betts and finish her. But after that think I'll do this challenge too.
There is no time limit, you can use whatever colors and embellishments you wish. This is something you can do at your leisure and have fun with. Once it is done they would love to have a picture of it so they can post it on the Woolwrights Hooking Guild web site. If you hover over "more" you will see a Chicken Challenge tab which you may want to visit from time to time to see the new additions.
Now for the pattern ~ just copy and enlarge to whatever dimensions you desire. Have fun.