So, with the news that came out early may we got the Shiai items introduced and amongst those items we had something reffered to as a color combo, which is a force and relax bundled into a pack. next to these items the icon/image of the force color is represented, outer joint part, left side, and the normal grey (qs?) color on the inner, right side, representing the relax color.

The joint combos could have had a minor overhaul with someone spending a few minutes C/P-ing the color to the "smaller side" to represent the relax color in the color combos. Same could be done with any future bundled colors. That way there would not have to be a refference pack / inverted pack in the shiai exchange to visually aid players before making a purchase / exchange.

Link for reference: http://forum.toribash.com/tori_token_exchange.php
Current icons:

If you're referring to something like this http://forum.toribash.com/showthread.php?t=198366, then i heartily agree, The only possible downside I can think of is the effort required

Solid suggestion, will do with June ST combos.