Well, you are using the wings1_UV/wings2_UV out of the Reference folder, yes?
In that case, it's very simple. Just open that up in an editing program, put the wing texture over it, color it, and then save it into the preset folder you want it in. And BOOM. It's on your preset. But rename it so you don't overwrite the base for it.
For example, let's say it's going into Preset2. I'd name it preset_2equip. Save it there.
Now open the material file in that folder.
Where the red #'s are, replace that with the number of the preset folder. If it doesn't have it already, paste this at the very bottom under everything else:
material preset_#_equipMatL
{
technique
{
pass
{
texture_unit
{
texture preset_#equip.jpg
}
}
}
}
material preset_#_equipMatR
{
technique
{
pass
{
texture_unit
{
texture preset_#equip.jpg
}
}
}
}
(Sorry for such a long post. XD)