Pink and purple are great colors for a baby-girl-quilt!
As far as choosing a pattern to use, you should consider 1) your sewing/piecing skills, 2) the time you have available to make the quilt, and 3) your quilting (as opposed to sewing/piecing) skills.
There are many recommendations in the QB archive for simple/easy/quick quilts, so I won't list them here. But if you can give us all a description of your skills, time available, and financial flexibility (like being able to hire someone to do the actual quilting), you are likely to get a more robust reply.
Good luck!