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Thanks Jan in VA.. for mentioning the *fraction* for some people they seem to think around anything but whole inch or half inch.... I found 1 1/4 finished inch logs look very nice, they are cut from 1 3/4 inch strips. With three rounds of logs... that makes 7.5 finished inches filled up with logs, and if a person makes a finished 1.5 inch center square, its a finished 9x9 inch block... a very versatile size.
Also, you can get creative and make an odd # of blocks in one or both directions... its not a bad look... each *colored* round can be different chosen colors... augment the asymmetry... good luck