I'm a bit out of control with the number of craft supplies.
Both my and the kids craft supplies are all together and available except for dangerous supplies of mine, which are in my sewing area or the easily overly messy supplies like paint which are higher on a shelf, but still visible so that they can ask for them if they want to paint.
I use old suitcases/overnight cases from the thrift store for storing felt, pipe cleaners, scrap fabric, scrap magazines/books, and each girl has their own suitcase for special projects. I use baskets for buttons, ribbon, and paper.
For the ribbons, I rewind them from their spools onto those doll-type clothespins and throw them in the basket. Much more visually appealing and easier to work with.
I have a vase of fake flowers and a bowl beside it to hold flowers that have fallen or been cut off. I have a plastic bowl that fills up with broken crayons that we then use in melted wax crafts.
I have a box filled with tons of odds and ends for them to use and re-use in crafts - old board games to make into new games, paint sticks, honestly I couldn't tell you what all is in there. Anything that I think "I can't throw that away - a kid would probably find a great use for that!
I have a jar of buttons for each child. I have a small photo book filled with flowers that we dry over the summer and a 'nature table' filled with nature stuff - moss/sticks/pinecones/pods/bark/shells - that we use for crafts.
I have a tiny jewelry making kit and a marker/crayon/pencil station at their craft table along with three wooden kitchen boxes (for flour/sugar) that I got a thrift store that have popsicle sticks, old-fashioned clothespins, and doll clothespins in them.
On the main huge white shelf with seven shelves, I have things pretty organized. Bottom shelf is for newspaper/brown bags/coffee filters/scrap paper. Second shelf is more specialized paper - drawing pads/tracing paper/scrapbook (origami in this house) paper/construction paper/shrinky-dink plastic/notepads. Third shelf is for glues/tapes/crayons/markers. Fourth shelf is for tons of misc stuff in little organizers. Clays/stamps/googly eyes/stickers/temp tattoos/sandpaper/balloons/really tons of little things kept organized there. Fifth shelf is all the paints. Acrylic/glass/tempera/face/fabric/watercolor (along with watercolor paper and pencils). Also all of the brushes and the glasses for holding water and the plates for holding paint. Sixth shelf is colored sand/feathers/miscellaneous dangerous/messy stuff. Seventh shelf is pompoms. Those are up high.
Closets hold my patterns and any extra supplies that I don't want visible or that I just don't have room for out in the main room. There are also some of those small shoe hangers that hold things like fabric embellishments and pasta for crafts.
I think that's all.