The pattern is at http://www.bevscountrycottage.com/nest.html She has the pattern below and patterns for Knit and Hoop nests.
CROCHETED Artificial Bird NestSeveral yards of Worsted weight yarn.
Hold 2 or 3 strands together for a TIGHT stitch!
Size H hook
Starting ring: Crochet 3 chains using 2 or even 3 strands of yarn held together, and slip stitch last chain to first chain to make a loop or ring.
Round 1: Chain 2 (this counts as your first “stitch), work between 10 – 15 single crochets into th ring (depending on what thickness yarn you are using). Slip stitch the last single crochet to the top stitch in the chain 2 that started this round.
Round 2: Chain 2. Single crochet into each of the next two stitches, then do 2 single crochet’s into the next stitch, single crochet into the next two stitches, then 2 single crochet’s in the the next stitch. And on and on around the circle. Slip stitch your last single crochet into the top of the chain 2 that started this round.
Round 3, 4, 5, 6, and on: Repeat Round 2 over and over, until your circle is at least 3” big. You can make your nest with a bottom as small as 3” big, up to maybe 6” big.
Once you have made the bottom of the nest from 3” to 6” big, from all rounds thereafter, crochet ONE single crochet into each stitch. You will see your “sides” begin to form.
Crochet until the sides are about 2 – 3” high. Bind off and weave in loose ends.
This will make all the same size nests. In order to make larger nests just keep increasing (as in rows 3, 4, 5, 6) until you have the desired size base. Then just stitch one SC in each stitch and it will begin to crate the sides. You can make these as large as you like. Remember that more than one bunny does use them at the same time. I would recommend limiting the size to 12 inches across or less.