Dazed and confused.
Join Date: Jul 2008
Location: Dublin, Ireland
If it's standard DW, it's black with red detailing. I'd switch it up, and make them
Red with black detailing. Close enough to suggest they're one army, whilst also showing some differences. You have to remember that painting the same scheme on one army can be be taxing, and possibly doubly so on two aesthetically different sets of minis. Having painted DW myself, while it is a relatively quick and easy scheme to paint, it can get get monotonous.
There's also the option of painting something completely different, but using your basing to tie them together thematically.