I am a collector–can’t throw anything away. Even blobs of dry paint that I’ve peeled off the bottom of a plastic cup . Even cracked pieces of watercolor paint occasionally come in handy in painting. But they especially come in handy when doing mixed media collage. A small dot of red paint makes a great eye, and stringy pieces make hair, etc. Gray paints make great scales. Most of them after they are thoroughly cured can be easily stored in a small container. They appear to stick together, but easily come apart.
Here’s a part of my collection of acrylic paints. Don’t hesitate to save them. Leave they out in the air separated for a week or so, and then they will be fully cured and will easily peel apart when stored together.