Get some cheap and useless vinyl records. Don’t use anything that doesn’t belong to you; instead, check out the local second hand store for cheap records.
Preheat your oven to around 200-250°f (100-120 Celsius). Make sure the kitchen area is well ventilated.
Put about 1/2 pound of dry beans into a linen or muslin bag. Tie the bag just like a bean bag toy so that it has just a little give to it.
Set your single oven rack to a low position. You want your bowl to form as close to the center of your oven as possible.
Place a heat proof bowl into a larger pot to stabilize it, and set the pot onto a baking sheet.
Carefully center the vinyl record on top of the bowl. In the center of the vinyl record place the bag of dry beans. You can also use a can of vegetables to get a flatter bottom. Just keep an eye on the process so that the flat bottom remains centered.
Put this into the oven. Keep a close watch because each vinyl starts to “flop” at a different time. It usually takes 4-8 minutes.
Take the whole thing out of the oven (wearing oven mitts, of course) once you notice some real “flopping” going on. You will only have a few seconds to adjust the angle of the bottom and the general shape of the bowl. This is why you need to watch it so closely as it molds.
Put your record into another bowl and shape it around that, or you can hand mold it. Sometimes, you might like the way it looks right as you take it out of the oven; if so, skip the molding.
Here is where you can get creative. Wear leather gloves as this bowl is hot and you can’t afford to drop it. You can pull in some folds or rolls to make it resemble a flower, or whatever you see in your mind.