Fit a small extension platform to a step-ladder for paint, brushes and tools to stand on. Make the platform by gluing and screwing two strips of wood underneath a 12mm piece of blockboard. The strips project beyond the platform to slot into two brackets fitted under the top tread of the step-ladder. Finally nail a narrow moulding around the edges of the platform to prevent the brushes and tools rolling off.
Also, an S-hook is a useful tool for hanging cans of paint safely.