Well just as an example. Open ItemMinIcon.ani and you will see stuff similar to...
Code:
[Item1100024]
FrameAmount=1
Frame0=data/ItemMinIcon/723117.dds
You'll want to add your item into this, with a path to the image you would like to be used.
Code:
[Item[COLOR="Red"]YourItemID[/COLOR]]
FrameAmount=1
Frame0=data/ItemMinIcon/[COLOR="red"]ImageToBeUsed.dds[/COLOR]
Simply find the Image for a scroll in your data/ItemMinIcon folder in the client.
Now open the MapItemIcon.ani, it's pretty much the same deal. As you can see below, the only difference is, the first line doesn't have "Item" before the ID.
Code:
[136303]
FrameAmount=1
Frame0=data/MapItemIcon/136700.dds