Need ideas for repainting Halo figures

I recently got the MCC for XB1 to finally play all the Halo games, and picked up some of the 6inch Halo figures made by Mattel. They’re cool figs, but the paint jobs are almost non-existent, so I want to make them look better.

I got the red Helioskrill, Elite Zealot, and Officer that came with the Ghost vehicle. Do the armors for these characters have alternate colors? I’ve seen the Zealot (I think) in blue and gold armor versions, but not sure if it’s simply a new paint scheme or if the armor is physically different.

Are there sites where people show their custom Halo figures?