I need a zombie citizen skin for zombie like ones in smod!!!!

Hi i am somewhat new here and hopefully im doing this right… anyway i am a big fan of smod but the down side is my pc broke so i decided to get a mac and since mods don’t work on macs i couldn’t play smod… i was wondering if you guy could help me get a citizen zombie skin with no headcrab for my hl2 and garrys mod game…

P.S if you guys could make the citizen zombie skin change randomly so the zombies would look different just like smod i would really appreciate it… if you dont understand what i mean-----> zombies have diffrents skins