The pattern is very easy, still it gives a nice texture to the dishcloth.
I found it in a German book of knitting patterns, called “500 Strickmuster”, published by XENOS Verlagsgesellschaft m.b.H., Hamburg 1984 (ISBN 3-8212-0196-7). It is not listed on ravelry and I could not link it. The pattern is called “Intarsienmuster” and is featured on p.20.