You shouldn't need colour to act as the next step indicator. What is it about your application that prevents "Next" or "Continue" buttoms from being used? Typically I'd stick with the expected norms that users for a particular platform have become accustomed too.
For 90% of applications, users just want to get something done as quickly and effectively as possible. So if you need colour to advise them of the next step then chances are your UI is too complicated. You may need to refactor some of your current single step screens into 2 or more less complicated screens.
Personally i think the better UI designs are the ones that we barely even notice. If the user has to waste brain cycles interpreting a UIs navigation system that requires them to associate blue with Go or Next then frankly i think its failed.... specially since where i come from "Green" would be more likely to mean "Go".
Btw who says you "need" to improve its navigation?? Do you really "need" too? Or do you just want to show off some potentially really cool, but probably completely unhelpful programming trick you just learnt? Cmon, be honest ;)