It all depends on how many you have of duplicates. If you have like four duplicates of one then there is more that you can do. I am making a lap size hidden wells quilts out of batiks. I am using 6 fabrics cut into strips of various sizes to make it. with FQ's anything stripy would work well. or ones that have squares or triangles. this way you get the most out of your fabric.
this one might work also
http://www.quilterscache.com/C/CelticSunriseBlock.html
http://www.quilterscache.com/S/StaroftheEastBlock.html
A log cabin would also work. just depends on what colors and what look you are going for.