I am a practical girl when it comes to thread I don't like to keep much cotton thread on hand because it does age and then breaks more easily. For that reason I use polyester thread for most of my piecing.
I store most of my thread in an Ikea Raskog cart right beside my sewing machine.
|Sulky Rayon thread for FMQing and all bobbins on tier 1|
|Tier two has some cotton thread in a bowl and lots of cheap polyester serger thread in a variety of colors|