How could I achieve the 2000’s/2010’s look

Looking at maps and mods from the early garry’s mod days always fills me with nostalgia and happiness. Multiple times I have tried to recreate this and yet I have failed at doing so. Although I haven’t been able to replicate the look I have noticed early mappers and modders would use advertisements and memes that were popular back in the day along with usually only using hl2 textures

Look at the old maps on the workshop, you will find beautiful examples.