Just wanted to list the ones I have used to io out 15 chars, the first one I farmed on it and it took way too long (sorting through recipes and crafting takes forever). So I never did any farming again. I should have around 4 bil left on my characters and haven't played in awhile so thought I would try to help a little.
Buy generic glad recipe, convert to Gladiator armor proc: have to sell when they deplete for like 14 to 15m a pop.
Shield wall proc: same.
Buy recipe, Convert generic Kismet to
kismet acc proc: sell when around 4m and a half or so. Sometimes you can see them sell for 6m when depleted.
Unbreakable guard recipes: some are are good straight out buys. Though they were starting to get overpriced.
41 defense recipe, convert to lotg, then to anything other than with recharge in enh. Takes a ton of time and fun. So only do this if you have time and need money now.
Buy generic gladiator's javalin and proc/all recipes, convert to proc or all effects. Takes a bit of time to sell but they will.