Paint Nights in pubs have become a fun outing for many adults and I’ve seen many Guiders adapting the idea for their units with great success. There are many painting instructional videos available on YouTube. If you have the capacity to play the video at your meeting, you could do it directly. Or you can have a couple of Guiders watch the video though a couple of times and provide the girls direction. The YouTube videos range in length from 30 min to about 1:30. This would likely take up a whole meeting or might be a great extended activity at an indoor camp or sleepover.
Typically you need a couple of different sizes of paint brushes per girl, a canvas (check dollar stores for inexpensive canvases), paint (feel free to use left over craft paint rather then acrylic) and some water.
If you want to complete the Paint Night experience, you might also want some light refreshments like popcorn and lemon aid.
Encourage the girls not to get too caught up in the exact instructions but instead to let their creativity shine. No one expects their painting to look just like the one in the sample/video.
This is an example of the sort of videos you find on YouTube.