I hate to always say "white or wow" only but if you don't specify one color you want then you will get 16 different varities of one color..Sometimes it doesn't matter but if you are making, say a blue/white quilt you don't want reds or pinks or yellows in there...I would much rather someone tell me what specific color they want and try to meet their needs then to just make what I think looks good and then they cant use it! The lst boom or so that I joined I didn't specify anything so ended up with strips with florals or colors that I will never use so I have a lot of UFO blocks in my bin...someday maybe Ill use them