unfortunately the original post is only in german http://greenxbird.blogspot.co.at/2013/09/diy-topflappen.html But it is not very complicated I started with a magic ring and with 3 chains for the first double crochet. lAdd 14 double crochets in the ring and close with a slip stitch. = 15 double crochets. 2. Rd: 3 chains, in each double crochet make two double crochets and close round with a slip stitch. = 30 double crochets. 3. Rd: 3 chains, in every second double crochet 2 double crochets and close with a slip stitch = 45 double crochets 4. + 5. Rd: In every 3rd stitch *2 dc, 1 ch, 2 dc* . 6. + 7. Rd: In the chain of the previous round make in each *3 double crochets 1 chain, 3 double crochets* . 8. Rd: In every chain of previous round make in each *3 dc, 2 chains, 3 dc* arbeiten. 9. Rd: In every chain of previous rd make *4 dc, 2 ch, 4 dc* . 10. Rd: In the 2 chains of previous Rd each 11 dc . Make 2 and crochet together.