Rainbow Vision. Colour is everywhere in nature, even on the coldest and most miserable of days; we just have to look for it.
Find a happy place to sit and start with the 'self'. Perhaps a breathing exercise such as can be found on the 'breathe' page.
Next start to look for colours. I always start with red and mindfully look for anything that is red. If I can't see anything, I simply move on to the next colour without judgement or beating myself up about it. Next go slowly through the colours of the rainbow and be surprised and amazed at the colours of nature that you can tune into.