  We present how we have created a series of bilingual (English and Welsh) STEM
activities focusing on rainbows, colours, light and optical effects. The
activities were motivated by the many rainbows that appeared in windows in the
UK, in support of the National Health Service at the start of the coronavirus
pandemic. Rainbows are hopeful and are very fitting to be used as a positive
iconic image at a time of much uncertainty. In this paper we explain how we
have developed and organised the activities, focusing on colours, computer
graphics and computer programming. Each lesson contains one or more activities,
which enable people to take an active role in their learning. We have carefully
prepared and organised several processes to guide academic colleagues to create
and publish different activities in the theme. Which means that the activities
appear similarly structured, can be categorised and searched in a consistent
way. This structure can act as a blueprint for others to follow and apply to
develop their own online course. The activities incrementally take people
through learning about colour, rainbows, planning what to program, design and
strategies to create colourful pictures using simple computer graphics
principles based in processing.org.
