Personally I like your leaf colours, and either the yellow or the last pic, but if you are anything like me, I get a combination I think looks good, then I consider the blocks I have already done that are near it, and have to start again!
Even doing that, I am planning to switch blocks 3 and 5 because I prefer them the other way round next to my centre 16.
Edit: Wooo Hooo just reached page 100!