Pick your own colours using jQuery! Almost like in Photoshop, but with less colorchoices. You can use it to change the textcolor in a textarea or just let your visitors change your textcolor on your website maybe?
This is a star-rating-plugin. Use this to let your visitors rate your content based on what they think of it. You can have up to how many stars you would like, but my advice is to use the maximum of 10.