The absolute ugliest was that Pennsylvania Dutch pattern called Friendship or something like that with, what was it, two people facing each other in a barnyard rendered in bold primary colors? I like the blue Cornflower and also have a bunch of the all white pans in the A style, the second design with the wider ears and better fitting covers. Although I like the P series a bit more because it was the first, the rubber snap on storage seals for the A series are great.
Then there is the white with the black swirl design that is on certain P-style pans and Electromatics and the green medallion made for Shell Gasoline giveaways with purchase--Buy gas get pans; use pans get gas. The round white pans were originally the buffet servers for the Centura when they had the white pyroceram covers with the black T-shaped knobs and are marked Centura on the base. The covers were designed long before microwave ovens started being sold as countertop size appliances and are not able to be used in them. The same round shapes in white with slightly domed glass covers were sold exclusively by Sears. Then the round pans were offered to all dealers in avocado & butterscotch with the solid Pyroceram lids with matching color round knob, but again, the cement that held the knob in place had a way of failing over time, generally resulting in someone holding the knob and the lid falling and breaking on the floor. If you find the lids intact, it's kinda rare. Corning discontinued the lid design since they cannot go in the microwave because of the metal shaft through knob and the whole cement failure problem. The metal shaft is not a screw. It has a knurled section where the cement was held. If the knob comes off completely and nothing breaks, you can mix up two part epoxy like Bull Dog and put it back together. It will hold very well if you use enough. I like to use the round 10" skillets as pie pans for Crumb Top Apple Pie. They are deep enough that you can really pile the apples high without the syrup boiling over.
Sometimes at estate sales you will see black metal trays with a round recess for the Buffet Server, fake wood grain handles on the sides and a slot along the back. The Buffet Server sat in this cradle and the lid was held upright in the slot during serving.
About the Electromatic perk parts on eBay: People offer the parts since they are not allowed to sell an item recalled for safety reasons, but I am told that sellers generally throw in the coffee pot for lagniappe when you buy the parts.