This stained glass pattern is a geometric 12 petal flower that is quite detailed.  If you enlarge this pattern (or ask for the pdf from me) at 30.6 inches round, then the structures in the center are bevels at 2.5 x 1.4 inches and they should work well.  Pattern is supplied unless you request as a black and white pattern for stained glass or window clings printable on letter size paper (actual size of round is 7.5 inches in diameter).
There are simpler versions of this pattern HERE and HERE.