Sorry if this is the wrong section to post this, am not sure where else to put it.

How do I make it so the thumbnail in game shows the wallpaper pattern itself? The thumbnail in the wallpaper section in game is a white square. Does it have something to do with my XML?

Moving to walls/floors. How did you do this, with granthes' tool? Last time I checked that didn't support image swatches. Also, for anyone to tell whether your XML is off you'd need to post it.

I don't know, I used WallEz.

XML:

<?xml version="1.0" encoding="utf-8"?>
<Package Creator="BlackJill" Filename="SquarePattern">
<Wall Price="4" Name="SquarePattern" Description="Wallpaper">
<Tag Type="Color" Value="Green"/>
<Tag Type="Style" Value="Wallpaper"/>
<Swatch Top="#006600" Middle="#006600" Bottom="#006600"/>

<TextureShort Filename="short.dds"/>
<TextureMedium Filename="medium.dds"/>
<TextureTall Filename="tall.dds"/>
</Wall>
</Package>

I made a wallpaper package a day ago and the thumbnail works fine. But this one doesn't, not sure why. I used the exact same XML template and I've compared both, but either I'm not seeing it or I'm derping.

Also, I have a second question: How do I go about adding multiple colors of the same wallpaper to the XML? I have three other colors of the same wallpaper:

orangeshort.dds
orangemedium.dds
orangetall.dds

blueshort.dds
bluemedium.dds
bluetall.dds

pinkshort.dds
pinkmedium.dds
pinktall.dds

I tried adding them to the same XML because I read in a thread (I can't recall where I found it, tried looking but I can't find it anymore) that you add them to the same XML but creating multiple <Wall </Wall> blocks like so:

<?xml version="1.0" encoding="utf-8"?>
<Package Creator="BlackJill" Filename="SquarePattern">
<Wall Price="4" Name="SquarePattern" Description="Wallpaper">
<Tag Type="Color" Value="Green"/>
<Tag Type="Style" Value="Wallpaper"/>
<Swatch Top="#006600" Middle="#006600" Bottom="#006600"/>

<TextureShort Filename="short.dds"/>
<TextureMedium Filename="medium.dds"/>
<TextureTall Filename="tall.dds"/>
</Wall>
<Wall Price="4" Name="SquarePattern" Description="Wallpaper">
<Tag Type="Color" Value="Pink"/>
<Tag Type="Style" Value="Wallpaper"/>
<Swatch Top="#006600" Middle="#006600" Bottom="#006600"/>

<TextureShort Filename="pinkshort.dds"/>
<TextureMedium Filename="pinkmedium.dds"/>
<TextureTall Filename="pinktall.dds"/>
</Wall>
<Wall Price="4" Name="SquarePattern" Description="Wallpaper">
<Tag Type="Color" Value="Orange"/>
<Tag Type="Style" Value="Wallpaper"/>
<Swatch Top="#006600" Middle="#006600" Bottom="#006600"/>

<TextureShort Filename="orangeshort.dds"/>
<TextureMedium Filename="orangemedium.dds"/>
<TextureTall Filename="orangetall.dds"/>
</Wall>
<Wall Price="4" Name="SquarePattern" Description="Wallpaper">
<Tag Type="Color" Value="Blue"/>
<Tag Type="Style" Value="Wallpaper"/>
<Swatch Top="#006600" Middle="#006600" Bottom="#006600"/>

<TextureShort Filename="blueshort.dds"/>
<TextureMedium Filename="bluemedium.dds"/>
<TextureTall Filename="bluetall.dds"/>
</Wall>
</Package>

Is that also wrong? I have a feeling that my first wallpaper package, the one that works, is a fluke.

Thank you for any help you may give, by the way. Am a bit lost at the moment.

There already is a support thread for that tool in this forum, where that kind of question has been asked (and answered) a few times already. Please post there.

To add additional walls to a package, you have to copy everything between the <Wall ... > and </Wall> tags (including the tags), and edit all the values you want to be different for your second wall color.

The </package> tag should be after all your walls.

Not sure what your thumbnail issue is, but Grant might be able to figure it out if you post over on his forum: http://forums.sims4.the-prof.net/viewforum.php?f=17