The green bed is the 14" size. Black Goldie can curl up in it easily as she only weighs 7lbs but her son Butch (on the right) is 17# and barely fits in. I probably won't make any more that size again.
The black bed on the left is 18" and easily fits 2 large cats but they are stuffed so a 19" would probably work better for them. The brown one on the right is 17" and will also fit 2 cats at once but fits a single cat very nicely. The brown one below is 16x18 (oval instead of a circle). Rainey enjoys it as it sits next to my reading chair. She's not a lap cat but does enjoy being close. When she's not in it though, others will hop in to be next to me. She's not happy about that and will pace the house for awhile until whomever has taken it over, gets out. She's picky that way.
Note that all of these are the 14" size beds. No two come out exactly alike but they will use them especially if they feel cold.
The pattern for these beds is here