Colors                    Categories          
+----+-------------+      +----+--------+  
| id | name        |      | id | name   |  
+----+-------------+      +----+--------+
| 01 | White       |      | 01 | Light  |
| 02 | Blue        |      | 02 | Dark   |
| 03 | Red         |      | 03 | Normal |
| 04 | Lt White    |      +----+--------+
| 05 | Lt Blue     |
| 06 | Lt Red      |
| 07 | Dk White    |
| 08 | Dk Blue     |
| 09 | Dk Red      |
+----+-------------+


Color_Categories         Color_Orders
+--------+--------+      +--------+--------+-------+
| col_id | cat_id |      | col_id | cat_id | order |
+--------+--------+      +--------+--------+-------+
|   01   |   03   |      |   01   |   03   |   03  |
|   02   |   03   |      |   02   |   03   |   02  |
|   03   |   03   |      |   03   |   03   |   01  |
|   06   |   01   |      |   07   |   02   |   02  |
|   07   |   02   |      |   08   |   02   |   01  |
|   08   |   02   |      +--------+--------+-------+
|   09   |   02   |      
+--------+--------+      

Table Color_Categories: contains colors linked to a categorie. may not contain all colors
Table Color_Order: contains colors and their linked category and an order number. may not contain all the colors or categories

Result:

List Of Colors ordered by order within a category (ex.: 02)

Result
+----------+
| Dk Red   |  (order = null)
| Bk Blue  |  (order = 01)  
| Bk White |  (order = 02)
+----------+