I am sure I sound like a broken record but I am still a big fan of the diagonal baby blanket in the project section of Joann's.com. You could easily use larger needles and start decreasing sooner. I have been told by several Mom's that I have made this blanket for that it the most functional, useful blanket they received.
A wonderful place to find baby blanket patterns is on Ravelry. They are free, you do have to join but it doesn't cost a think and you have access to hundreds of patterns. I found these that look like they would be nice for a bulky yarn. http://www.ravelry.com/patterns/library/f440-encore-chunky-lace-baby-throw
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