The only legit way of adding missing textures to GMOD is by buying CSS. Why? Because most of Garry's Mod's servers use CSS's textures. If buying CSS doesn't fix all missing textures you can buy or get games like: Day of Defeat, Team Fortress 2, Half Life, Half Life 2. (You can refund them if the problem doesn't fix itself).


CSS on Steam:
https://psteamproxy.yuanyoumao.com/app/240/CounterStrike_Source/

To fix the missing textures problem, using the shady way, you have to:
1. Close Garry's Mod.
2. Download CS:S addon for Garry's Mod here[files.fragboss.com]. (If link gets removed, look up "Gmod css textures").
3. Extract the downloaded addon.
4. Go to C:\Program Files (x86)\Steam\steamapps\common\GarrysMod\garrysmod\addons folder.
5. Put in the downloaded addon in the folder.
6. Open Garry's Mod.

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Made by: somethingnew.