Buy moddable schematics from the AH, not sure what server you are on but they sell for like 700-1000 credits on mine, dirt cheap. Craft these and sell them, mats aren't expensive and the items sell well. 8000 - 12000 credits each for moddable gear at my lvl (31).
Also the rule of thumb I generally go by is make 6 of the same green at a time, RE them all, 95% of the time you'll learn the blue in less then 6 RE's. Make 6 blue and RE them and you have a pretty good chance at the epic. I've got about 11 epic patterns on my toon and I'm lvl 31 with 270 in synthweaving. If I don't get the epic within 6 then I usually just move on. I've noticed though that it seems to work better if you make 6 at a time and then RE them, doing 1 every once inawhile doesn't seem to work very well.