Wish there was way more than just knitting, like yes it's a cool and relaxing thing, but maybe there could be way more to painting? Like you could choose a category, like animals, flowers, scenery, etc.
As well as maybe making a sketchbook or something, so you could draw anywhere if it was in your inventory.
Also maybe the knitting station, there could be an option to inventory some knitting stick-things and some yarn so you could knit in the chair, or standing, or somewhere else than the station.
Maybe there could be an arts and crafts store/building? Like a small, 30x30-20x20 plot with a cute, rustic - or modern - kinda building. It could be an option for buildings, like library, cafe, and such, are.
There could be an order option where you could order higher qualities of knitting sticks and yarn in different colors. Where you could buy the sketchbook, colors and pens/drawing kit and coloring kit in different qualities. Paint! For painting! Qualities of those, maybe not colors, but qualities. Also brushes.
So, all in all, my suggestions are(Braces show if something is optional in my opinion);
-New things
-Sketchbook
-Can be inventoried so the sim can draw anywhere as long as it's in their inventory
-Knitting sticks
-Can be inventoried so the sim can knit anywhere as long as it's in their inventory
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-Arts & Crafts Store/Get-Together/Building
-Community of knitters or other "arts & crafters"
-New group categories(Get Together Expansion pack), like Knitting, Painting, etc.
-Build and Buy lot option
-Order option(Art)
-Sketchbook{Of different qualities}
-Knitting sticks{Of different qualities}
-Colors, like markers and pencils}Of different qualities}
-Paint and brushes{Of different qualities}
-Yarn{Different qualities and colors, thickness(Thick, medium, thin)}