Here you can test the Colorcell colorchooser. You don't actually create a cell.

Caution: You have to submit each color!

Step 1:
Choose color and brightness of field 1.

Step 2:
Submit color (click submit field).

Step 3:
Choose color and brightness of field 2, 3 and 4. You have to submit each color.

Step 4a:
If you want to change a color, click on the field you want to change, set its color and press the submit field.

Step 4b:
If you like your cell, click the "I'm satisfied" field.