Rainbow Colour Hunt - Rainy Day Activity. We had SO Much fun doing this Rainbow Colour Hunt! The best bit, is that it requires NO SET UP AT ALL. This is also great for a parent who is poorly or needs a rest for whatever reason - get the kids off and find things. And you MAY just find a pot of gold at the end. Great for Rainy Days or St Patrick's Day or just to fill and 10min or 60min here and there!