This might be strong, harmony, in tune, in the groove, powerful, unstoppable, etc. Now what colour would relate to that performance and the mood they feel. This can be practiced to the point where the colour can trigger the images you want. Visualization puts this into practice. It involves first controlled breathing to relax yourself then goes through a series of images or mental movies.
Visualization can be long term goal setting or short term skill improvements and check lists.
I like to have athletes visualize during each stoppage in play. Picture you putting any left over garbage, tensions, problems at school, home or relationship in the can and close the lid. There is a lock on the can. Lock it for safe keeping See a room with some big screen TV and stereo equipment and in the middle is a soft chair for you to sit in. On the screen is your visualization channel.