How do you do it? Do you just go with the studio colors, try and emulate something, or just pick some colors you like? Or something else?
I myself need inspiration to want to paint models, which is why my QK are currently on indefinite standby and my Corregidor is almost entirely painted.
With Corregidor I was originally going to go with inspiration from Desperado Enforcement LLC(From Metal Gear Rising), but ended up watching way too much Tron: Uprising in the meantime, and looking at the models I thought the look could transfer. That and because I've learned to hate working with red as a color, as I can't seem to get it to shade or brighten for the life of me.
With my slowly growing JSA forces I found inspiration from the Shinsengumi, especially their portrayal in the Rurouni Kenshin OVAs; years before I ever actually saw the show. Something about being basically a Feudal SWAT team with the coolest coats in the land has always resonated well with me.
Anyhow, that's my current inspirations/paint scheme reasons. May end up making my QK into Desperado Enforcement at this rate, who knows.