You can do the oo mixture again this morning if you wish and might get more stones but its not necessary. Depends on whether you feel your body is up to it. I'm sure the green things were bile stones, not avocado, they're very soft - that's normal. (and avocado would almost certainly have been digested, its a fruit, very easy to disgest)
With Chron's I think its very important to do an enema or colonic after the flush (I guess coffee enema is fine) to make sure the colon is clear and all the stones and bile were flushed out and not caught in the colon and releasing toxins back into your system. But maybe you should wait till evening to do it or even the next morning. Because the epson salts will be working pretty good to flush you out during the day.