Here is another suggestion - how about a stripy lone star centre
Attachment {!-- ia2 -->stripy lone star.JPG{!-- ia2 --> not found
I admit I cheated a bit, I copied 4 reels onto paper and had a play.
1. measure in 1/4" from top left hand corner,
Attachment {!-- ia1 -->img428.jpg{!-- ia1 --> not found
2. cut at a 45 degree angle{!-- ia0 -->img428 cut.JPG{!-- ia0 -->