Dont get surprised if I havent answered at your question on my workshop item. I never respond there, only deleting non-english commentaries.

Anyways, first of all, you need to choose image that you like, then resize it to 512x512(paint can help you), save it to .bmp\jpg or whatever(better to jpg). Then, go ahead and open VTFedit program. When you are in VTFedit, click "File">"Import">choose the image with 512x512 size. Once you've done with that part, click "Save As..." and name it as "background01". File format must be in .vtf ! Once you've done with this stuff, we are moving to next ones. Create the folder. Call it however you like.(If you planned to post your item in workshop, then name it properly.)
Open your new folder, in new folder create another new folder and name it as "materials", get in that materials folder, create another folder and name it as "vgui". Get in vgui folder and create last folder and name it as "objective". Once you've done with this one, grab your new background01.vtf and drop it in objective folder. Now, 2 more steps.

Head to the vgui folder. Your new objective is, you will have to create an preview of your background. Make a screenshot of your new background or something and resize it to 256x256, then save it as background.vtf file. Once you've done with that, drop that new 256x256.vtf file into "vgui" folder. Last thing is, you need to create an ".vmt" file. Personally, I am using standart text from .vmt file. Create an textfile and write down:

Originally posted by background.vmt:

UnlitGeneric
{
$basetexture "vgui/background"
$vertexcolor "1"
$vertexalpha "1"
$translucent "1"
$ignorez "1"
$no_fullbright "1"
}

When you are done with that, press "File">"Save as..." and name it as "background.vmt".



Now head back to your first created folder. Create textfile and name it as "addoninfo".
Open that textfile. Write down next stuff.(Some stuff might be useless, but thats what I am using at this moment.)

Originally posted by addonsinfo.txt:

AddonsInfo
{
addonSteamAppID "238430"
addonTitle "My personal background."
addonDescription "This is my personal background for my phone"
addonImage "background"
addonURL0(optional, doesnt shows in game)
addonAuthor "Your nickname"
}

Save it.
Drag your created folder with stuff into Contagion>contagion>addons folder.

Now, when you are done with all that stuff, you'll need to package that stuff right into .vpk file. Its simple.
To create a .vpk you must open the contagion/addons folder and your Steam/SteamApps/Common/Contagion/bin folder. Once you have both windows open and the vpk.exe visible, simply drag your add-on folder that is inside the contagion/addons folder into the vpk.exe. You will then see a quick command window and a .vpk file with the name of your add-on will appear in the same folder as your add-on folder that is inside the contagion/addons base folder.

And thats it, I guess. Might be hard a little to understand(half asleep), but hopefully you wont get any troubles here.
Open your Contagion game>head to "Extras">addons>enable your new addon.

very intresting

Didn't work. "ORIONN`1.VPK" is not a valid Source Engine add-on. Installation Failed.
even if I do the vpx convert without click it, it still doesn't show in Exta<addons

that looks dam hard to make

Originally posted by Clone303:

that looks dam hard to make

Its pretty much easy, but I can make a video if youll need it.

Originally posted by John:

Didn't work. "ORIONN`1.VPK" is not a valid Source Engine add-on. Installation Failed.
even if I do the vpx convert without click it, it still doesn't show in Exta<addons

make sure the "addoninfo.txt" is in the same folder as the "materials" folder, not in the "materials" folder.

Had that same mix up

Thanks Orphanage! Works great. I made one for personal use, the same background my real cell phone is using. :)

Originally posted by Orphanage:

Originally posted by Clone303:

that looks dam hard to make

Its pretty much easy, but I can make a video if youll need it.

Could you make a video please..

Originally posted by Fruhling In Paris:

Originally posted by Orphanage:

Its pretty much easy, but I can make a video if youll need it.

Could you make a video please..

Yeah...will post today\tommorow hopefully.

Sorry for reviving an old thread, i followed all these steps and the wallpapers are working however when i go into the addons section it shows multiple copys of the tutorial map and doesnt show my wallpaper mod. nothing threatening to the game just something that has been bugging me. anyway to fix this?

I've done it and it works, try doing it all over again

Originally posted by Meshire:

Sorry for reviving an old thread, i followed all these steps and the wallpapers are working however when i go into the addons section it shows multiple copys of the tutorial map and doesnt show my wallpaper mod. nothing threatening to the game just something that has been bugging me. anyway to fix this?

Make sure you compiled VPK file correct, also double check addoninfo.txt . Maybe something missing in there?

i have the same problem with meshire, for some reason my first file worked perfectly(except for name dupe glitch) but when i try to do the other files it doesnt work like meshire says. And i may've think i compiled the VPK file correctly but i just followed your instructions, there is nothing missing.

Originally posted by Orphanage:

Originally posted by Clone303:

that looks dam hard to make

Its pretty much easy, but I can make a video if youll need it.

Please do. That can help expand the Workshop

Mine ended up randomly showing up on my phone after a patch update for some reason