I use fabric elastic pony tail holders around bobbins to keep the thread from unwinding.
I'm temporarily using this to store my limited thread/bobbins: plastic snack bag, or larger zip lock bag holding the spool of thread with its matching bobbin(s). I'm sure there's a better way, but it works for me right now.
I use painters tape ($1 store kind seems to work okay) as a guide to qult straight grid lines.
I use the pre-packaged cold cut containers (I think Sara Lee brand) to store various pins, fabric clips, quilt pins, etc. The container is flat, so you can easily pick up the pins from the container, the top is secure, and you can stack the containers to save storage space.
I don't close quilt pins when storing them. When I need the pins I take a handful of pins and toss them. When they fall they come apart.
I have a pin cushion that has sections where I organize different types of straight pins. I have a number of pin cushions and try to keep the pins organized.