One for the most common cotton blends is cotton spandex. Sometimes referred to as cotton lycra. Lycra is a brand name for spandex, but they are indeed the same thing. Cotton is typically easy to dye. It has a great stretch and recovery. It has a decent drape, but isn't as flowly as other lighter weight knits. Anything with cotton in it is going to need to be preached because of some slight shrinkage. Cotton blends come in different weights and stretches, it will depend on what it is blended with. Because of the cotton, these blends will also make the fabric breathable.
Ideas on what you can make: Leggings, tops, dresses, cuffs, underwear. It’s especially good for children’s clothing as it’s pretty durable.