Can you tell me what mods you downloaded? For the most part, you shouldn't have to create and move the images around manually. Most mods will come with them all set up.
However, that doesn't mean all. Here's what I would do...
1) Delete all UI folders save for the default
2) Download the mods you want
3) Create custom UI folder
4) Copy ALL files and their structure exactly the way it is in the folder to your custom folder.
5) Create eq2.ini (unless the mod comes with it) and make sure it is saved correctly. Your icon should become a white page with an orange gear on it if you saved it correctly. If it's still a white icon for text, it's not saved correctly.
6) Make sure your UI names match and that the eq2.ini file has the correct format.
__________________
|