Colour Scheme Help!

It might help if you start off by thinking about the things you want in your wedding. For example, do you have favourite flowers? Does the groom want to wear a specific suit/tie? Maybe have a look at things like designs for wedding stationery and see if anything in particular stands out. You may find that a colour scheme develops naturally from one of these things.

But if you love sage green and your only reason not to have it is that it is 'overdone', then I'd go with that anyway. Sage green may have been used in hundreds of weddings (what colour hasn't?) but it hasn't been used in YOUR wedding before. So don't avoid a colour you genuinely love just because other people have used it.

I really like the idea of a multi colored theme with yellow, blue and pink. But because this doesn't seem to have been done much I can't find much inspo.
In September you can get lots of sunflowers so I would suggest navy or burgandy