Okay, thank you.
Although, I don't fully understand the first of your options, and I'm too lazy to make second IDs for tons of objects.
But thanks for the clarification, nonetheless.
http://cs.elderscrolls.com/constwiki/index.php/De-Isolation_Tutorial is the best solution. If you don't want to use that and don't want to manually direct "tons of objects" to use the appropriate meshes and icons, there is another way to do it.
1. Load your .esp and the one that has the stuff you want in the CS. make sure your mod is the Active file.
2. Find the stuff you want from the other mod and change the EditorID (the name in the CS, not the name that appears in game).
3. You will be asked if you want to create a new form. Select "yes" and your mod will now have a version of that item with all the appropriate meshes and icons selected.
4. Repeat steps 1-3 for each item you want from the other mod.
Be warned that this method can cause problems if you intend to release your mod. I have never experienced problems with this method myself, but I've never released any mods I've done this with. Others
have reported problems with this method.