One of the bigger problems I'm having is trying to keep stuff sorted. I do okay by color-coding categories of stuff and labeling the bags (green for fruit and veg, pink for meat and stuff to donate)... but I could really use a couple more colors.
Yellow perhaps? Purple? Black? Zebra striped? I was thrilled when we got pink and blue, was really hoping we'd see more soon.
Editing to add: I know all sorts of dye/tailor things have been suggested... I'm more partial to adding a couple of new colors to the existing items we have.