Most of these guys were painted in 2011 and 2012, with a this one below and another done just two months ago.
The Wyches kit is fantastic and these are great minis, although a lot of work. For the Wych cult, the colours are essentially the same as for the Kabalites, but swapped around a little.
Below is the Raider for the Wyches, painted in November 2015.
I thought it looked pretty cool. The rest of the fleet is shown below, a Ravager, a Raider and a Venom. These are Kabal rides, so I painted them very dark green, with not much decoration.