Combine consoles and monitors! Or literally any Combine prop, having variations of those is always amazing! Love this idea btw!!

edit:
I read in one of your comments that you wanted to do alternate skins of props as well at some point. Some HL2 Beta props, especially furniture, are retail models with different skins and minor quality variations. Those would be a good thing to look at for alternate skins!

Might be along list but hopefully this will give some good ideas!

Like the above post says, New Combine Props and Beta Variations of existing props.

More vehicle variants perhaps?

This supply crate addon as a skin for the regular crate:
https://psteamcommunity.yuanyoumao.com/sharedfiles/filedetails/?id=2435340753&searchtext=supply+crate

Pre-War(Not destroyed) Versions of the Air Boat, Scout Car, and Muscle Car?

Grey skins for the Bhutan Canisters:
https://gamebanana.com/mods/182544

I'll think of more but for now this is all I got, This Idea is amazing and i hope you continue for as long as possible.

i think it'd be really funny if you added a green skin to the breen can and anything related to the breen can

Speaking of the Breen cans, red and yellow skins for the vending machine is another good idea.

More road signs

More variants of props from the props_wasteland folder?

Green and Grey TrashBin01a skins for green waste and garbage respectively

color variants for vending machines?

More combine things? Like computers or barricades

tall skinny crate

bigger furniture's

Add laptop

maybe a blue soda bottle?

half life alyx prop in style of hl2?

https://psteamcommunity.yuanyoumao.com/sharedfiles/filedetails/?id=2668737615

a prop for the 1984 novel in garbage_001a

Here from the discord!
Mappers love to use these boxes from half life 2
But they're not actual models!

Good references are in kliener's lab, d1_trainstation_05

Would love to see these as models!


screens:
https://cdn.discordapp.com/attachments/563239770394722317/1044750672840638635/20221122160551_1.jpg
https://cdn.discordapp.com/attachments/682720535234609160/1044683290432512020/20220216134804_1.jpg
https://cdn.discordapp.com/attachments/682720535234609160/1044683290151497889/20220216134803_1.jpg
https://cdn.discordapp.com/attachments/682720535234609160/1044683289702715472/20220216134756_1.jpg
https://media.discordapp.net/attachments/682720535234609160/1044683289467822110/20220216134832_1.jpg?width=1214&height=683

an easy to acess spawnmenu