Many thanks to mra4nii for allowing me to use his mod Show Motifs for a reference.
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This mod adds in icons that show what type of crafting material you have. This makes it easier for sorting through your crafting materials.

To install, just copy ShowMaterials to your Add On's folder in ESO. Typically C:\Users\YourUserName\Documents\Elder Scrolls Online\live\AddOns.

Features:

• Custom made icons for each material type.
• Text version of icons if you prefer those
• English, German and French localization.

FAQ:

• Is this compatible with other add ons?
  I believe so, if it is not submit a bug report.
• Where did you get the textures?
  I created them based off the material types.