You will need
2 x paint rollers or 2 x 3 inch emulsion brushes
small brush for painting the edges
Use a spirit level, tape measure and a bit of chalk to mark the wall where you want the two colours to blend.
Use a small brush and paint in the edges neatly before filling in the large areas with a roller or 3 inch emulsion brush.
Always start from the top of the room and work down, so if there are any drips you'll be able to paint them out as you go.
When you get to the chalk line with the first colour, just let the roller or brush run out of paint along the line so you have a lovely uneven feathered edge.
Start the next colour along the line just beneath and work upwards into the first colour to get the flocking effect, then carry this colour down to the skirting or floor.
Once both colours are dry, you can work on the blended line with one or both of the paint colours.