My usual method is to do an ITP swirl (i.e, "In The Pot"), which I do right before I pour the soap into my mold when my soap is at med-thick trace. I know a lot of people say light trace is better, but for whatever reason a thicker trace works best for me.
Basically, I have the main bulk of my soap in my pot, and I have my swirl colors set aside in separate measuring cups thoroughly stickblended to smoothness with some of my main, raw batter.
As I'm bringing my main batter to trace, I intermittently hand-stir my colored portion/s off and on every now and again with a spoon to keep things fluid/workable.
When my main batter is at med-thick trace, I take my cup/s of colored soap, hold it/them high up in the air and pour into my pot in different spots. As I'm pouring, I simultaneously lower my arm/s from high to low so that the colors hit the bottom of my pot and reach all the way up to the top.
When done pouring my colors, I take my rubber spatula and give my soap one or 2 very brief turns (don't overdo- less is more), then I pour.
Once in my mold, I take a chopstick and stick it straight down perpendicularly into my soap in one corner and slide just the bottom of the chopstick diagonally across the bottom of my mold to the far corner (keeping the top of the chopstick in the starting corner), and then I lift it up out of the soap as horozontally as I can. Then I do the same with the other corner and also straight down the middle.
I get good swirls doing it this way.
IrishLass